Final answer:
To ring up a mocha with a Cruisin card and a $10.00 Gift Certificate, add the mocha to the sale, apply Cruisin card rewards, then use the Gift Certificate to cover the remaining cost, if any additional amount is owed, collect it from the customer.
Step-by-step explanation:
Ring up a customer who wants a mocha with her own Cruisin card and a $10.00 Gift Certificate for her boss involves a few steps. First, you would ring up the mocha as a regular sale. Then, you would apply any discounts or rewards that the customer has earned on their Cruisin card to the transaction. Finally, if the mocha's cost does not exceed the $10.00 value of the Gift Certificate, you would apply the Gift Certificate as a payment method for the remainder. If there is a balance still owed after the Gift Certificate, you would collect the remaining amount from the customer through their preferred method of payment. Should there be a remaining balance on the Gift Certificate after the purchase, you should inform the customer of the remaining value.