Sam's Fruit Cellar earns a $0.40 profit for each apple that it sells and a $0.40 profit for each banana that it sells. Which expression shows Sam's total profits from selling apples (a) and bananas (b)?

A.
0.40(ab)

B.
0.40(a + b)

C.
0.40 + a + 0.40 + b

D.
0.80(ab)

The correct answer is B. 0.40(a + b).

We know that Sam's Fruit Cellar earns a $0.40 profit for each apple (a) and a $0.40 profit for each banana (b) they sell. To find the total profits from selling apples and bananas, we need to add the profits from selling apples and the profits from selling bananas, which can be represented by the expression 0.40(a + b).