Answer :
Plan B will be preferred
Explanation:
year Plan A Discount (15%) Present value
1 $3 0.8695 $2.3085
2 $3.05 0.7561 $2.306105
3 $3.10 0.6575 $2.03825
4 $3.15 0.5718 $1.80117
total $8.754025
Year Plan B Discount (10%) Present value
1 $0.5 0.9090 0.4545
2 $1.75 0.8264 1.4462
3 $3.25 0.7513 2.4417
4 $6.80 0.6230 4.644
total $8.9870
Thus, from the above calculation, it is clear that investment in plan B will be more fruitful as it will yield more amount of money as has been calculated by present value method.