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Welcome back. I hope you had fun trying to solve the problem.

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I'm sure you did great.

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As you noticed in the workspace I created the challenge which just created an empty shell

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for the problem.

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And I've also got the challenge solution which has my solution to the problem.

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Okay. So let's start looking at the code here.

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We know what we had to solve.

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So let's look at some of these really simple statements first.

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And I'll mark this up just so it's easier for you to follow.

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So in this case, I'm simply outputting welcome

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then I've defined a variable here which is going to hold small rooms.

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And I've initialized to 0, that's the best practice. I'm prompting the user.

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And I'm asking them to put in the number of small rooms they want cleaned.

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I'm doing exactly the same thing here except we're doing large rooms.

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And now we've got to define 2 declared constants right.

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We're going to declare one is the price for a small room

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and one is the price for a large room, 25 and 35, respectively.

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We've got our sales tax declared constant here, and we've got our estimate

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expiry constant.

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So far so good. It's exactly the same as we did before.

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The only thing is I'm adding the large rooms.

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Okay. So let me clear this and I'll scroll up just a little bit

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and let's take a look at some of the calculations.

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Here are some of the output statements,

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and you can see here I'm as I'm outputting the number of small rooms which is just

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whatever the user typed in and the number of large rooms which is whatever they typed in.

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The price per small room and the price per large room right here,

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those are our declared constants which I'm outputting. Now the cost.

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The calculation is really simple it's the cost of the small rooms plus the cost of the large rooms,

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and we calculate each one by

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price per small room times the number of small rooms

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plus and there's my plus sign. Remember you can split these across lines so you can

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line up the insertion operators like that it makes them nice and easy to read.

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So in this case, I'm just calculating the cost for the small rooms, and I'm adding

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the cost of the large rooms to it.

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Same thing with tax. I'm calculating the cost again.

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And I'm multiplying the whole thing by sales tax.

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Notice that I've got those parentheses here because what I want to do is

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I want to calculate the whole cost

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and then multiply that by the sales tax. Otherwise,

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I won't get the correct answer.

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Got to make sure the whole thing is here.

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So this becomes all the small costs plus all the large costs.

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Okay. Then finally, the total estimate just takes the cost

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and adds the sales tax to it. That's it.

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The estimate is valid for 30 days and there's my program.

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So you can see that

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my formatting is probably going to be a little bit different from your formatting,

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and mine might be a little bit more readable.

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But you may not have split things across lines like I did.

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It's real good practice to split these across lines that way you can

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really see what's going on, and it's much, much easier to follow.

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Okay. Well, I hope you enjoyed the challenge, and I hope you did well.

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Remember, there's a lot of duplicated code here that we're going to clean up as the course progresses.

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And this program -- we'll actually modify this program a little bit later

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on when we use functions.

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Okay, so that's it for the challenge.