Vista Company manufactures electronic equipment. In 2018, it purchased from an outside supplier the special switches used in each of its products. The supplier charged Vista $2.1 per switch. As an alternative, Vista's CEO considered purchasing either machine A or machine B so the company could manufacture its own switches. The CEO decided at the beginning of 2019 to purchase machine A, based on the following data:

Complete this question by entering your answers in the tabs below. Required 1 Required 2 Required 3 Assume that machine A has already been purchased. 15 it preferable to use machine A to make the switches or to purchase the switches from the external supplier? OUse machine A to make the switches. OPurchase the switches from the external supplier. Complete this question by entering your answers in the tabs below. Required 2 Required 1 Required 3 Assume that machine A has already been purchased. At what annual volume level should Vista consider replacing machine A with machine B? (Do not round intermediate calculations. Round your final answer up to the nearest whole number.) units (per year)