Question 1 (a) Given = , calculate the percentage change in k due to small Ko .360 increment of x% in T and small decrement of y% in p. (9 marks) ( b ) Find and classify the critical points f(x, y) = 120x + 120y - xy - x2 - y2. (10 marks) (c) Iff = F(x, y) and x = ret and y = re , prove that of of of 2x-= rar and 2yay =r ax + at ar at (6 marks) (Total Marks: 25)