Maximum revenue:-
A deli sells 640 sandwiches per day at a price of $8 each.
(A) A market survey shows that for every $0.10 reduction in price, 40 more sandwiches will be sold. How much should the deli charge for a sandwich in order to maximize revenue?
(B) A different market survey shows that for every $0.20 reduction in the original $8 price, 15 more sandwiches will be sold. Now how much should the deli charge for a sandwich in order to maximize revenue?