Your father gives you $100 to go to town and buy 100 chickens, the prices are as follows:
You have to buy at least one of each kind of chicken, what are the numbers of each kind of chicken you need?
Well, I kinda cheated to get the answer. I wrote a Qbasic program to figure all the permutations that work. I did optimizes it, I went though the Chicks in steps of 2 (to get rid of the decimal). I also only went up to 20 Hens because at that point you are already out of money. But other then that I just did the equivalent of smashing the circle block in to the square slot with a hammer.
Here are my answers, I got a total of 11: