Challenge 82

The Farmer's Puzzle

Difficulty level:

One farmer, who wanted to test his son's intelligence, called him and said:

- Son, take $ 100. I want you to buy 100 heads of cattle with that money. However, there can be no shortage or money left and it has to be 100 heads of exact cattle, being the price of each animal is:

Taurus: $ 10.00
Cow: R $ 5,00
Calf: $ 0.50

And one more thing: you have to bring at least one animal from each.

How did the farmer's son make this purchase?