For example : [substeps] If they gave you $20 to buy a $5 book, they will leave with $5 worth of book plus $15 worth of change, for a total value of $20. [title] Add up the amount the customer gives you.
[header] How to give back correct change [title] Make sure the change you give and the price of the product together add up to the cash the customer gave you. [step] You want the customer to leave with the same value they gave you, only now part of that value will be the product, and the rest change. It's that simple.