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
Jason earned 1 - 1/3 = 2/3 of the money by babysitting.
The skateboard and helmet cost a total of 45.50 + 18.25 = $<<45.50+18.25=63.75>>63.75.
So, Jason earned 63.75 * (2 / 3) = $<<63.75*(2/3)=42.50>>42.50 by babysitting. Answer: \boxed{D}.