We know that n = number of students attending, that they spent 300 dollars, and they charge 5 dollars per student. We also know that they want 1,500 dollars profit. So, let's use this to write an equation.
5 dollars per student, subtract the cost to run/start the event, is the same as 1,500.
So, your answer is A,
5n - 300 = 1,500.
