Answer:
a.
2.5%
b.
2.45%
Explanation:
The approximate real rate of return can be derived from nominal rate of return formula given below:
nominal rate of return=real rate of return+inflation rate
real rate of return=nominal rate of return-inflation rate
real rate of return= 4.7%-2.2%=2.5%
The exact real rate of return can be derived from exact real rate of return formula given below
real rate of return=(1+nominal rate of return)/(1+inflation rate)-1
real rate of return=(1+4.7%)/(1+2.2%)-1
real rate of return=1.02446184 -1=2.45%