Consider the profit function P(x) = - x + 310x 7400, where P is the profit in dollars by making and selling 'x' items. a) How many items should be made to maximize the profit? b) What is the maximum profit? a) 310 b) $31425 O a) 155 b) $16625 a) 310 b) $7400 O a) 155 b) $24025