Finding $\,\%\,$ of salary relative to another salary

Question

Sam makes $\$65$ per week and Don makes $\$138$ per week.

How do I express, as a percentage, how much more Don makes per week than Sam does?

Answer 1

$$\text{Don earns}\;\;\left(\frac{\text{Don's earnings}-\text{Sam's earnings}}{\text{Sam's earning's}}\; \times 100 \%\right) \;\;\text{more than what Sam earns}$$

$$\dfrac {138 - 65}{65}\times 100\% \approx 112.31\%$$

This tells us that Don earns $\;\approx \;112.31\%\;$ more than Sam earns.