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:
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.
