BRAIN EXERCISE

Every sweet comes with 1 sweet wrapper

1 sweet costs $1

Now the store is having a promotion,

with every 3 wrappers collected, you are entitled to exchange for 1 sweet.

How many sweets can you eat with $15?

A) 0

B) 15

C) 20

D) 21

E) 22

tag in my tagboard for the ans!

Ans will be out on my next post :)