5%+100=105%=105/100=1.05
**without following years:
[saving - spending]*years*1.05^years=
[2548*(1.05) -2548]5*1.05^5=812.99
[2548*(1.05) -2548]25*1.05^25=
[2548*(1.05) -2548]50*1.05^50
