When Old McDonald was young and had just started his farm, animals were cheaper then. Each cow costed $10, every pig $3, and every chicken $0.50 [they ate a lot of chicken].

When Young McDonald had started his farm, he spent exactly $100 and had bought 100 animals.

How many chickens did he buy when he first started his farm?

Assume he bought a non-zero number of cows, pigs, and chickens.

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