The number of students enrolled at a college is 15,000 and grows 4% each year

The number of students grows by 600 per year

I am not sure the question that you are asking here but I may be able to help you out. To figure out how many physical students that the college gains you have to multiply 15000 and 4%. However, you have to make the 4% into a decimal. In order to do that, you have to move the decimal place two places to the left. This would make 4% into 0.04. When you multiply 15000*0.04, you get 600. Then you go from there to answer whatever question you wanted answered.

The correct answer is $90