(d) A consumer has 10 dollars to spend on apples and bananas. The consumer's preferences can be repre-sented with the utility function u(a, b) =ab, where a is the quantity of apples and b is the quantity of bananas.If apples cost 1 dollar each, and bananas cost 0.5 dollars each, how many of each fruit should the consumer buy to make themself as satisfied as possible with their purchase? Explain why.