there are 25 painters an 80% of them are painting the interior how many painters are painting the inside

20 painters are painting the inside

Step-by-step explanation:

Question:- If a carpenter charge $825 for 15hr plus $278 for materials.. What is the carpenters rate per hr

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Now, since we need to find the rate per hour, we divide or set up a proportion.

825/15 = x/1

Cross multiply

825*1 = 825
15*x = 15x

15x = 825

Divide

15x/15 = 825/15
x= 825/15
x= 55

Now, since they told us that materials are also in the price, we need to add that too.

$55 per hour + 278 dollars for materials

55+278 = 333

But since the rate means how much, we do not need to include any materials cost. 

We have our final  $55 per hour