How to solve the following ATM Code with If Statement for withdrawing.

ATM Machine Algorithm . Ask user for the amount to withdraw - convert the string to a number . is the amount > $100, then provide a $100 bill & subtract $100 is the amount still > $99, then provide another $100 bill & subtract $100 is the amount > $20, then provide a $20 bill & subtract $20 (maybe repeat 3 times] is the amount > $10, then provide a $10 bill and subtract $10 is the amount > $5, then provide a $5 bill and subtract $5 provide the remaining amount in single $1 bills ATM Machine Algorithm . Ask user for the amount to withdraw - convert the string to a number . is the amount > $100, then provide a $100 bill & subtract $100 is the amount still > $99, then provide another $100 bill & subtract $100 is the amount > $20, then provide a $20 bill & subtract $20 (maybe repeat 3 times] is the amount > $10, then provide a $10 bill and subtract $10 is the amount > $5, then provide a $5 bill and subtract $5 provide the remaining amount in single $1 bills