
Net present value method is a measure to compare the current worth of cash inflows and current worth of cash outflows to determine the profitability of an investment decision.
Payback Period:
Payback period refers to the time period needed to recover the amount invested in project from the
Formula to calculate payback period,
Cash flow is as statement of sum total of income received also referred as cash inflows and expense incurred referred as
To compute: Payback period and net present value (NPV) of the investment.

Explanation of Solution
Payback Period
Given below is the table for the computation of payback period:
Year | Net cash flows ($) | Cumulative net cash flows ($) |
0 | | |
1 | 1,000 | |
2 | 2,000 | |
3 | 3,000 | |
4 | 6,000 | |
5 | 7,000 | 4,000 |
Formula to calculate total payback period,
Substitute $3,000 for negative cumulative cash flows of 4th year and $7,000 for net cash flow of the 5th year.
Hence, payback period of investment of $15,000 is 4.4 years.
Net Present Value (NPV)
Given below is the table for the computation of Net Present Value (NPV).
Year | Cash flows ($) | Present value of 1 at 10% | Present value of net cash flows ($) |
1 | 1,000 | 0.9091 | 9,09.10 |
2 | 2,000 | 0.8264 | 1,652.80 |
3 | 3,000 | 0.7513 | 2,253.90 |
4 | 6,000 | 0.6209 | 4,098.00 |
5 | 7,000 | 4,346.30 | |
Total cash flows | 13,260.10 | ||
Invested amount | 15,000 | | |
Net present value | |
Hence, NPV for investment is $(1,739.90) as the total flows did not recover the invested amount of $15,000.
Payback Period
Given below is the table for the computation of payback period according to the website detail:
Year | Net cash flows ($) | Cumulative net cash flows ($) |
0 | | |
1 | 7,000 | |
2 | 6,000 | |
3 | 3,000 | 1,000 |
4 | 2,000 | 3,000 |
5 | 1,000 | 4,000 |
- As per above table, the cash flow is positive after 2nd year, hence it can be said that cash flow is received after 2nd year.
- In order to find the actual payback period, divide the negative cumulative net cash flows of 2nd year by the net cash flow of the 3rd year, then add the given duration to the 2nd year.
Formula to calculate total payback period,
Substitute $2,000 for negative cumulative cash flows of 2nd year and $7,000 for net cash flow of the 3rd year.
Hence, payback period of investment of $15,000 is 2.66 years.
Net Present Value (NPV)
Given below is the table for the computation of Net Present Value (NPV).
Year | Cash flows ($) | Present value of 1 at 10% | Present value of net cash flows ($) |
1 | 7,000 | 0.9091 | 6,363.70 |
2 | 6,000 | 0.8264 | 4,958.40 |
3 | 3,000 | 0.7513 | 2,253.90 |
4 | 2,000 | 0.6830 | 1,366.00 |
5 | 1,000 | 0.6209 | 620.90 |
Total cash flows | 15,562.90 | ||
Invested amount | 15,000 | | |
Net present value | |
Hence, NPV for investment is $562.90.
Hence, the project as per book sum has higher payback period and negative NPV as compared to website sum. This will result in rejection of the project.
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Chapter 24 Solutions
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