Continuing the previous problem (the model in part a) one step further, assume that shirts and ties are also 7.4 Advertising Response and Selection Models 379 complementary. Specifically, assume that...

Continuing the previous problem (the model in part a) one step further, assume that shirts and ties are also 7.4 Advertising Response and Selection Models 379 complementary. Specifically, assume that each time a shirt is purchased (and is not accompanied by a suit purchase), 1.3 ties, on average and regardless of the price of ties, are also purchased. Modify the model from part a of the previous problem to find the prices of suits, shirts, and ties to maximize overall profit.