Answer: 19.4
Step-by-step explanation:
Given
Profit is given in terms of the selling price

to get the maximum price, differentiate y w.r.t x

Put
to get maximum value

Thus, the company must sell it at 19.4
true because if you add up 4 90°you get 360
X axis should be first and then Y axis, So, the answer is (2,1)