Nominal Interest Rate =______

The correct option is Real Interest Rate + Inflation rate.

To understand why this is correct, we can look at the relationship between nominal interest rates, real interest rates, and inflation. This relationship is defined by the Fisher Equation in economics.

The Fisher Equation states that the nominal interest rate is approximately equal to the sum of the real interest rate and the expected inflation rate. Mathematically, it is expressed as:

$$\mathrm{Nominal\; Interest\; Rate}=\mathrm{Real\; Interest\; Rate}+\mathrm{Inflation\; Rate}$$

Here is a breakdown of the terms:
1. Nominal Interest Rate: The interest rate actually stated on a loan or investment, which does not account for the effects of inflation.
2. Real Interest Rate: The interest rate adjusted to remove the effects of inflation, reflecting the real change in purchasing power.
3. Inflation Rate: The rate at which the general level of prices for goods and services is rising, which erodes the purchasing power of money.

Therefore, to find the nominal interest rate, you must add the rate of inflation to the real interest rate. This makes Real Interest Rate + Inflation rate the correct choice.