Ok, there could be two answers to this question. If the question is asking how much he would make if it was .15% more, the total would be 27,600/a year
However, if it's asking .15% <u>of</u> 24,000, your answer would be 3,600 ( as in the extra he would be making)
To find the answer, you would have to multiply 24,000*.15 (your starting value times how much you would like to multiply it by)