Asneaker store salesman had $4,125 in total monthly sales last month. he made $165 in commission from those sales. what is the salesman's commission as a percent of his total monthly sales?

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

4%