He made \(\frac{165}{4125}\) as a commission. To turn that into a percentage, you need to make the bottom become 100. Multiply the top and bottom by \(\frac{100}{4125}\) to get the proper fraction. The fraction now is \(\frac{\frac{16500}{4125}}{100}\) This simplifies to \(\frac{4}{100}\). Now all you need to do is take the top of that fraction to get the percentage, which is 4%.
4%
