(a) A company sells two types of electric blenders, Model A and Model B, where x and y represent the number of units sold of Model A and Model B respectively. The daily revenue function is given by: R(x, y) = -0.02x + 80x-0.05y + 60y - 0.02xy (i) Find Rx(x, y) and Ry(x, y). [8 points] (ii) Calculate Rx (100, 300) [ 3 points ] (iii) Calculate Ry (100, 300) [3 points]