The production department is proposing the purchase of an automatic insertion machine. It has identified 3 machines, each with an estimated life of 10 years. Which machine offers the best internal rate of return? Machine A Machine B Machine C Annual net cash flows $50,000 $40,000 $75,000 Average investment $250,000 $300,000 $500,000

a. Machines A and B

b. Machine B only

c. Machine A only

d. Machine C only

Can you please show work