Required: 1. Assume that machine A has not yet been purchased. What is the annual volume that would make the company indifferent between the two decision alternatives (i.e., purchasing and then using machine A to make the switches versus purchasing the switches from the outside vendor)? 2. Assume that machine A has already been purchased. Is it preferable to use machine A to make the switches or to purchase the switches from the external supplier? 3. Assume that machine A has already been purchased. At what annual volume level should Vista consider replacing machine A with machine B? 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. 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.) Volume level units (per year)