Piecewise function. a house painter charges $12 per hour for the first 40 hours he works, time and a half for the 10 hours after that, and double time for all hours after that. how much does he earn for a 70-hour week?

Given that a house painter charges $ 12 per hour for the first 40 hours he works, time and a half for the 10 hours after that, and double time for all hours after that, to determine how much does he earn for a 70-hour week The following calculation must be carried out, proposing a linear function:

(40 x 12) + (10 x 12 x 1.5) + (20 x 12 x 2) = X 40 x 12 + 10 x 18 + 20 x 24 = X 480 + 180 + 480 = X 1,140 = X

Therefore, the house painter earns $ 1,140 for a 70-hour week.

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First 40 hours rate = $12 per hour.

Next 10 hours charge ( Upto 50 hours) = A half of $12 that is $6 per hour.

And after next 10 hours chrges ( More than 50 hours) = 2 times of initial rate, that is 2*12 = $24 per hours.

Let us take variale x for number of hours and f(x) is the function for total earning for x hours.

So, we can setup a piecewise function as

       

Therefore,

70 hours can be divided into = 40 hours + 10 hours + 20 hours.

Total earning of 70-hour week =  12* 40 hours  + 6 * 10 hours + 24*20 hours

= 480 + 60 + 480

= $1020.

Therefore, he earn $1020 for a 70-hour week.

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.

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