You have exactly 100 coins

There are 3 kinds of eggs:

A costs 7 coins for 1 egg

B costs 3 coins for 1 egg

C costs 1 coin for 3 eggs

Edit: there's one condition: you have to buy from all 3 kinds

How many eggs of each type do you need to buy in order to have spend exactly 100 coins?

**Edited by Maggi, 09 November 2008 - 08:50 PM.**