Question

The revenue from selling xshirts is r(x) 15x The cost of buying x shirts is c(x) 7x + 20. The profit from selling xshirts is px) x) (x) What is p(x)?

Answer 1

The profit would be the difference between the total amount earned after selling each and every shirt and the costs of buying them so

p(x)= r(x)- c(x)

7x-20?

Answer 2

The revenue will be the difference between the revenue and the cost.

So if the revenue for X shirts is r(x) = 15x and the cost is c(x) = 7x + 20

the profit will be p(x) = r(x) - c(x) = 15x - 7x -20 = 8x-20

where you can see that your profit starts to be positive when you sell at least 3 shirts.