Ruby Language

Create a cash register that can keep track of money and dispense change. The register should be able to handle bills of denominations 20, 10, 5, 2 and 1. Given a dollar amount, the register should be able to dispense the appropriate number of bills to make that change. In cases where change cannot be made using the bills in the register, you should raise an error.

REQUIREMENTS

Must handle denominations 20, 10, 5, 2, and 1

Must be able to represent available moneys as a string

Must be able to add money to register

Must be able to take money from register

Must be able to dispense change for dollar amounts