Nominal Interest: A More Complicated Problem 9. Henry Mueller Supply Co. sells tamperproof thermostats. Annual cash flows are shown in the table below. Determine the future worth of the net cash flows at a nominal interest rate of 10% per year. 4. 5 Year 1 Income, $1000 200 Cost, $1000 90 2 200 90 3 200 90 5 200 400 180 6 200 90 7 200 90 8 200 90 90