Top quiz sms

A shop is selling candies at Rs. 1 for each candy, plus it is giving a free candy for 3 empty candy wrappers.
You have only Rs. 15.
How many candies can you buy?
.
.
.
.
Answer:
22.
Eat 15 candies and return the 15 wrappers
you get 5 more candies.
eat 3 more candies and return 3 more wrappers from the 5 new candies and get 1 more candy
Now you have total 2+1 candies left....
eat them and return their wrappers
and get one more candy......
so 22 candies in TOTAL.