The following is known about the investment: The previous year spent on design costs of 10,000 euros The acquisition cost of the investment is  100,000 First year net cash flows  20,000 Second year net cash flows  50,000 Third year net cash flows  60,000 The residual value of the investment is  20,000 Return on investment requirement 12% Investigate your investment through different investment calculation methods. Show your calculations. Discounted repayment period: Net present value: Relative net present value method: Internal interest rate: