r = [FV/PV]1/n - 1
FV = 10,000
PV = 7129.86
n = 5
Solve for r.
FV=PV[1 +R]^N
10,000 =7,129.86[1+R]^5 divide both sides by 7,129.86
1.4025521=[1+R]^5
1.4025521^(1/5)=[1+ R]
1.07 =1+R
R=1.07 - 1
R=0.07 x 100 =7%
