Dunkin Lab plans to purchase a new centrifuge machine for its Arizona facility. The machine costs $158,000 and is expected to have a useful life of 9 years, with a terminal disposal value of $3,000.Savings in cash operating costs are expected to be $37,500 per year. However, additional working capital is needed to keep the machine running efficiently. The working capital must continually be replaced, so an investment of $12,000 needs to be maintained at all times, but this investment is fully recoverable (will be "cashed in") at the end of the useful life. Dunkin Lab's required rate of return is 12%. Ignore income taxes in your analysis. Assume all cash flows occur at year-end except for initial investment amounts.

Requirement 1. Calculate net present value. (Use factors to three decimal places, X.XXX, and use a minus sign or parentheses for a negative net present value. Enter the net present value of the investment rounded to the nearest whole dollar.)

The net present value is

$35,215

.

Part 2

Requirement 2. Calculate internal rate of return. (Use a trial-and-error approach and straight-line interpolation as necessary. Round all present value calculations to the nearest whole dollar and round the IRR to two decimal places, X.XX%.)

The internal rate of return (IRR) is

%._________

PLEASE HELP HAVING TROUBLE GETTTING THE IRR % I AM CONFUSED, PLEASE GIVE STEP BY STEP INSTRUCTION.