Real Interest rate is the nominal interest rate adjusted for Inflation. It can be calculated using the following formula:
RR = (NR- IR)/(1+IR)
Where RR is real rate, NR is nominal rate and IR is inflation rate. In this problem, Nominal Rate NR = 11% and Inflation Rate IR is 4%. Therefore, Real rate would be:
RR = (0.11 -0.04)/(1+0.04)
RR = 6.73%
Therefore, real rate of return would be 6.73%.