Your objective is to buy exactly 100 farm animals with exactly 100 dollars. You must buy at least 1 of each animal. You may need some paper!
The Costs:
Cows: $10 each
Pigs: $ 3 each
Chickens: $0.50 each

Answer
5 cows=$50
1 pig=$3
94 chickens=$47
100 animals=100 dollars