Jason is saving up for a skateboard and helmet. The skateboard is $45.50 with tax and the helmet is $18.25 with tax. He earned

1/3
of the money by mowing lawns and the rest by babysitting. How much did Jason earn babysitting?

A.
$19.13

B.
$21.25

C.
$30.33

D.
$42.50

First, we need to find out how much money Jason earned in total by adding the cost of the skateboard and helmet: $45.50 + $18.25 = $<<45.5+18.25=63.75>>63.75

Then we need to find 1/3 of that amount to find out how much money he earned mowing lawns: $63.75 * 1/3 = $<<63.75*1/3=21.25>>21.25
Finally, we subtract the amount earned from mowing lawns from the total to find the amount earned by babysitting: $63.75 - $21.25 = $<<63.75-21.25=42.50>>42.50
So the answer is D. $42.50.