\f2. Safe Shades produces two types of sunglasses; Tortoise one sells for $17 Black one sells for $21. The total revenue in thousands of dollars per year for the sale of x thousand glasses at $17 each and y thousand glasses at $21 each is given by R(x, y) = 17x+21y. The company has determined that the cost per year equation for these sunglasses is given by C(x, y) =4x -4xy+2y' -1 1x+25y-3 a. Find the Profit function. [5 points ] 9 W A 11:46 PM ENG 13 12/3/2022by C(x, y) =4x -4xy+ 2y-1 1x+25y-3 a. Find the Profit function. [5 points] b. Use calculus to find the critical point of the profit function and show that this is a maximum [10 points] c. How many of the tortoise and the black sunglasses must be sold for maximum profit? [3] 9 ENG 11:47 PM 12/3/2022 13