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)?
0.40(ab)
0.40(a+b)
0.40+a+0.40+b
0.80(ab)
0.40(ab)
0.40(a+b)
0.40+a+0.40+b
0.80(ab)