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Answer:
Let the rate of the commission be x%
Now, according to the given problem
The total monthly earning is
[tex] \frac{120000x}{100} + 7500 = 13500 \\ 1200x = 13500 - 7500 \\ 1200x = 6000 \\ x = \frac{6000}{1200} \\ \boxed{ x = 5}[/tex]
Therefore, the rate of commission is 5%