In: Economics
You invest $50,000 now and receive $10,000 per year for 15 years starting at the end of the first year. What is the discounted payback period? Use i = 9% annual rate compounded annually. Give the discounted payback period between two consecutive integers.
investment of 50000 and return of 10000 every year for 15 years
i = 9%
We need to find net present value of each cash flow and then find cumulative cash flow
We need to find year when cumulative cash flow turns positive
using excel
Year | Investment | Return | Discount factor | Present Value | Cumulative cash flow |
0 | -50000 | 1.000000 | -50,000.00 | -50,000.00 | |
1 | 10,000.00 | 0.917431 | 9,174.31 | -40,825.69 | |
2 | 10,000.00 | 0.841680 | 8,416.80 | -32,408.89 | |
3 | 10,000.00 | 0.772183 | 7,721.83 | -24,687.05 | |
4 | 10,000.00 | 0.708425 | 7,084.25 | -17,602.80 | |
5 | 10,000.00 | 0.649931 | 6,499.31 | -11,103.49 | |
6 | 10,000.00 | 0.596267 | 5,962.67 | -5,140.81 | |
7 | 10,000.00 | 0.547034 | 5,470.34 | 329.53 | |
8 | 10,000.00 | 0.501866 | 5,018.66 | 5,348.19 | |
9 | 10,000.00 | 0.460428 | 4,604.28 | 9,952.47 | |
10 | 10,000.00 | 0.422411 | 4,224.11 | 14,176.58 | |
11 | 10,000.00 | 0.387533 | 3,875.33 | 18,051.91 | |
12 | 10,000.00 | 0.355535 | 3,555.35 | 21,607.25 | |
13 | 10,000.00 | 0.326179 | 3,261.79 | 24,869.04 | |
14 | 10,000.00 | 0.299246 | 2,992.46 | 27,861.50 | |
15 | 10,000.00 | 0.274538 | 2,745.38 | 30,606.88 |
Cumulative cash flow turns positive in 7th year
Discounted pay back period = year bef cash flow turns positive + (cumulative cash flow in year bef the positive value/net present worth of cash flow in the year where cumulative cash flow turn positive)
= 6+(5,140.81/5470.34)
= 6+ 0.93976
= 6.939 years = 6.94 years
Showing formula in excel
Year | Investment | Return | Discount factor | Pressent Value | Cumulative cash flow |
0 | -50000 | =1/((1+0.09)^A19) | =B19 | =E19 | |
1 | 10000 | =1/((1+0.09)^A20) | =C20*D20 | =E20+F19 | |
2 | 10000 | =1/((1+0.09)^A21) | =C21*D21 | =E21+F20 | |
3 | 10000 | =1/((1+0.09)^A22) | =C22*D22 | =E22+F21 | |
4 | 10000 | =1/((1+0.09)^A23) | =C23*D23 | =E23+F22 | |
5 | 10000 | =1/((1+0.09)^A24) | =C24*D24 | =E24+F23 | |
6 | 10000 | =1/((1+0.09)^A25) | =C25*D25 | =E25+F24 | |
7 | 10000 | =1/((1+0.09)^A26) | =C26*D26 | =E26+F25 | |
8 | 10000 | =1/((1+0.09)^A27) | =C27*D27 | =E27+F26 | |
9 | 10000 | =1/((1+0.09)^A28) | =C28*D28 | =E28+F27 | |
10 | 10000 | =1/((1+0.09)^A29) | =C29*D29 | =E29+F28 | |
11 | 10000 | =1/((1+0.09)^A30) | =C30*D30 | =E30+F29 | |
12 | 10000 | =1/((1+0.09)^A31) | =C31*D31 | =E31+F30 | |
13 | 10000 | =1/((1+0.09)^A32) | =C32*D32 | =E32+F31 | |
14 | 10000 | =1/((1+0.09)^A33) | =C33*D33 | =E33+F32 | |
15 | 10000 | =1/((1+0.09)^A34) | =C34*D34 | =E34+F33 |