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.

