you buy a new piece of equipment for $32,000 and as a result, over the next ten years, you receive cash inflows of $5500 per year for the first five years, $3500/yr for the next two years and $1,000/yr the last two years. what is the internal rate of return?

a. 9.69

b. 6.74

c. 5.43

d. 7.21