The monetary multiplier is calculated using the formula:
\[ \text{Monetary Multiplier} = \frac{1}{\text{Reserve Requirement}} \]
In this case, the reserve requirement is 20 percent, which can be expressed as a decimal:
\[ \text{Reserve Requirement} = 20% = 0.20 \]
Now, substituting the value into the formula:
\[ \text{Monetary Multiplier} = \frac{1}{0.20} = 5 \]
Therefore, the monetary multiplier will be 5.