Average Rate of Return The following data are accumulated by Lone Peak Inc. in evaluating two competing capital investment proposals: 3D Printer Truck Amount of investment $84,000 $80,000 Useful life 4 years 9 years Estimated residual value 0 0 Estimated total income over the useful life $10,920 $37,800 Determine the expected average rate of return for each proposal. If required, round your answers to one decimal place. 3D Printer % Truck %