If you would like to know Trevor's total employee benefits, you can calculate this using the following steps:
x% of $28,600 is $33,500
x/100 * 28,600 = 33,500
x = 33,500 * 100 / 28,600
x = 117.13% = 117%
117% - 100% = 17%
The correct result would be 17%.