Answer:
4%
Step-by-step explanation:
It is given that a person has money invested at 9 percent and the rate of inflation is 5 percent.
We need to find the actual interest rate.
Real interest rate = Rate of interest - Rate of inflation
Substitute the given values in the above formula to find the actual interest rate.
Real interest rate = 9% - 5%
Real interest rate = 4%
Therefore, the real interest rate on their investment is 4%.