A cannery purchased a machine for $5000 in June, at the beginning of the canning season, they will save $500 per month for the 4 months each year that the plant is in operation. Machine is expected to last 5 years with no maintenance costs and no salvage value. What is the nominal annual rate of return? Book answer is 38.4%, I keep coming up with 28%. Supposed to use P/A and P/F equations to solve.