a) b) Suppose, the sales revenue given by the following equation S 200x + y2+4xy where x is the amount spent on radio advertising and y is the amount spent on television advertising. If the company plans to spend RM2600 on these two means Of advertising, how much should it spend on each method to maximize its sales revenue? (10 marks) manufacturer produces 20-inch light and 3 -inch light. Suppose that x is the number of thousands of 20-inch light and that the demand for these is given by P1 = 50 x where p: is in Ringgit. Similarly, suppose that y is the number Of thousands Of 31 -inch light and that the demand for these is given by pz = 60 2y, where is also in Ringgit. Cbag*iCOoint cost function for these lamps is C = 2xy (in thousands of Ringgit). Therefore, Chamkin's profit (in thousands of Ringgit) is a function of the two variables x and y. Determine Chamkin's maximum profit. (10 marks)