The following estimates have been obtained for the market demand for cereal In Q= 9.01- 0.68 In P+0.75In A-1.3M, where Q is the quantity of cereal, P is the price of cereal, A is the level of advertising and M is income. Based on this information, determine the effect on the consumption of cereal of: a: A 5 percent reduction in the price of cereal. b: A 4 percent increase in income. c: A 20 percent reduction in cereal advertising.