Question

Which expression will help make the following problem easier to solve using mental math? Robert bought 15 lollipops that cost $1.40 each.

15(1) + 1(0.4)

15 • (1 + 0.4)

1 • (15 + 0.4)

15(0.4) + 0.4(1)

Answer 1

one lollipop = 1.40
for 15 you would use:
15(1.4)
Option B.
15 * ( 1 + .04) = 15 * (1.40)