Brainteaser:

A farmer went to the market with exactly $100 cash. When he got there, he found that cows were $15 each, geese were $1 each, and chickens were $0.25 each. Being the clever farmer that he was, he left the market with EXACTLY 100 animals, and spent EXACTLY $100. Plus, he had AT LEAST ONE of each kind of animal.

    

What did the farmer buy?  Email me if you can figure it out...