A machine makes two components; call them types A and B. It takes 550 seconds to switch production between the component types. During that time, no production occurs. When in production, each unit of A or B requires 0.5 second to be completed. The two components, A and B, are combined in an assembly process to make a final product; call it C. The assembly step can combine the two components into 1 unit every 4 seconds, or 15 units per minute.

a. Suppose the machine rotates between one batch of 2,200 units of A and 2,200 units of B. In that case, what is the capacity of the machine in component pairs per minute, where a component pair is one unit of A and one unit of B?

I already know the answer is 40 for this part

b. Suppose the machine rotates between one batch of 2,200 units of A and 2,200 units of B. In that case, what is the capacity of the machine in component pairs per minute, where a component pair is one unit of A and one unit of B?

I already know the answer is 25 for this part

c. Suppose the machine rotates between one batch of 2,200 units of A and 2,200 units of B. In that case, what is the capacity of the machine in component pairs per minute, where a component pair is one unit of A and one unit of B?

I already know the answer to this part is 963

d. Suppose the machine rotates between one batch of 2,200 units of A and 2,200 units of B. In that case, what is the capacity of the machine in component pairs per minute, where a component pair is one unit of A and one unit of B?

I need help solving this part of the question. The previous questions that were similar or the same as this one. They all have an incorrect answers for part d.