A company sell x units of a product whose profit is given by the function P(X)=20X-X^2

A) how many units should the business sell in order to maximize profits = 10

B)How much is the maximum profit = 300

C) What is the maximum number of units the business can sell to make a profit

p(x)=-x^2+20x

-B

x= 2A

X= -20 = 10 P(10) = -10^2+ 20(10) = P(10)= 100 + 200 = 300

2(-1)

Can anyone help me get the answer to C and check my answers please