At the point of sale, the merchant would calculate the amount owed by the customer and indicate the amount, and may prepare an invoice for the customer (which may be a cash register printout), and indicate the options for the customer to make payment.
Performing push-ups works a variety of muscles in your upper body, including specific muscles within your abdomen, chest, shoulders and upper arms. You can vary your technique by placing your hands at different widths to emphasize one area over another.
Push-ups work muscles in the arms, chest and shoulders, including the triceps muscle. Learn about improving overall upper body strength with push-ups with help from a strength and conditioning specialist in this free video on exercise and fitness tips.