Should the greedy algorithm recognize a 50 cent coin?

Question

What if the change owed is greater than 50 cents?

Shall I count 50 cents as a coin or use two 25 cent coins instead?

Answer 1

You should only use quarters, dimes, nickles and pennies. If the input is 0.5, your program should output 2 since 50 cents contain 2 quarters.