A baker determined the annual profit in dollars from selling pies using p(n) = 52n - 0.05n^2 , where

A baker determined the annual profit in dollars from selling pies using p(n) = 52n - 0.05n^2 , where n is the number of pies sold. What is the annual profit if the baker sells 400 pies?

p(400) = 52(400) - 0.05(400)^2
p(400) = 20800 - 0.05(160000)
p(400) = 20800 - 8000
p(400) = 12800