Hi Maths Help Forum

Year Out In Discount Net Present Value
0 247,332 1 -247,332 -247,332
1 25,000 0.8772 25,000 21930
2 25,000 0.7695 25,000 19237.50
3 30,000 0.675 30,000 20250
4 30,000 0.5921 30,000 17763
5 35,000 0.5194 35,000 18179
6 35,000 0.4556 35,000 15946
7 40,000 0.3996 40,000 15984
8 40,000 0.3506 40,000 14024
9 45,000 0.3075 45,000 13837.50
10 45,000 0.2697 45,000 12136.50

From the above table (is this complete?) how would you work out the payback period in years?