To determine the mechanical advantage of a machine, you can use the formula:
[tex]\[
\text{Mechanical Advantage} = \frac{\text{Load}}{\text{Effort}}
\][/tex]
In this scenario:
- The effort applied is 20 N.
- The load lifted is 80 N.
Using the formula:
[tex]\[
\text{Mechanical Advantage} = \frac{80\, \text{N}}{20\, \text{N}}
\][/tex]
When you divide 80 N by 20 N, you get:
[tex]\[
\text{Mechanical Advantage} = 4
\][/tex]
Therefore, the mechanical advantage of the machine is 4. Thus, the correct answer is:
d. 4
