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.
The pushup chiefly targets the chest, shoulders and triceps, the muscles on the back of the upper arm. In the chest area, pushups work the pectoralis major, the thick, slab-like muscles that span from the collarbone to the upper ribcage. As the shoulders drive the motion of raising and lowering your body, the pushup focuses on the main muscle of this body part, the deltoids.