The Wedding Shower Gift - Math Riddle

Janie's friends were chipping in to buy her a wedding shower present. At first, 10 friends chipped in, but 2 of them dropped out. Each of the 8 had to chip in another dollar to bring the amount back up. How much money did they plan to collect?


Explanation :  $40 (10 at $4, or 8 at $5)