The discounted payback period is the time it takes for the cumulative discounted cash flows to equal or exceed the initial investment. To calculate the discounted payback, we need to calculate the present value of each cash flow using the cost of capital of 10%. The present value of each cash flow is calculated as follows: Year 1: $50,000 / (1 + 0.10)^1 = $45,454.55 Year 2: $100,000 / (1 + 0.10)^2 = $82,644.63 Year 3: $150,000 / (1 + 0.10)^3 = $112,233.45 Year 4: $40,000 / (1 + 0.10)^4 = $28,925.62 Year 5: $25,000 / (1 + 0.10)^5 = $15,248.42 Now we can calculate the cumulative discounted cash flows: Year 1: $45,454.55 Year 2: $45,454.55 + $82,644.63 = $128,099.18 Year 3: $128,099.18 + $112,233.45 = $240,332.63 Year 4: $240,332.63 + $28,925.62 = $269,258.25 Year 5: $269,258.25 + $15,248.42 = $284,506.67 The discounted payback period is the time it takes for the cumulative discounted cash flows to equal or exceed the initial investment of $200,000. In this case, it takes approximately 2.6380 years for the cumulative discounted cash flows to equal or exceed $200,000. Therefore, the correct answer is e. 2.6380 years.