Answer:
since the positive cash flows are blocked for one year, you have to adjust your cash flows:
year         cash flow
0 Â Â Â Â Â Â Â Â Â Â Â -$160,000
1 Â Â Â Â Â Â Â Â Â Â Â Â $0
2 Â Â Â Â Â Â Â Â Â Â Â $348,400
3 Â Â Â Â Â Â Â Â Â Â Â $416,000
4 Â Â Â Â Â Â Â Â Â Â Â $306,800
5 Â Â Â Â Â Â Â Â Â Â Â $260,000
discount rate = 7%
using a financial calculator:
NPV = -$160,000 + $1,063,318.63 = $903,318.63
IRR Â = 102.94%