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)