How many chocolates can you totally get??

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A shop Sells 1 chocolate at Re.1 each.
You can exchange 3 wrappers for 1 chocolate.
If you have Rs.15, how many chocolates can you totally get??

Apparently 90% of the people who try this get it wrong.

Try before you Click here for Answer

Answer is 22 chocolates
15 chocolates with Rs.15
than with 15 wrappers you get 5 more chocolates
With 3 wrappers from the 5 new chocolates you get 1 more chocolate
And with these 1 more wrapper and the remaining 2 wrappers you get 1 more chocolate
Hence you get total 15 + 5 + 1 + 1 = 22