Josh's Jog-a-thon

Josh recently ran at a Jog-a-Thon for his school. Last year, he completed 13 laps. So, I figured...what the heck...I'll donate $1 per lap. Everyone else who donated, also went with $1 per lap. The day of the Jog-a-thon, Josh came home very excited to tell us that this year, he ran 19 laps. If he follows suit next year....I better lower my donation amount - or save up!!!