Suppose you make and sell doughnuts You sold about 200 doughnuts a week when the price of each doughnut was 5 dollars You discovered that when you increased the price of each doughnut byS dollars. your sales decreased by about 50 doughnuts per week. [a] What is the demand function, assuming that it is iinear? [b] If it costs you 3 dollars to make each doughnut, what selling price would give you maximum profit weekly