A school has a 50 x 60 yard rectangular playground. There are 3 classes playing on it. 15 students are from Mrs. Red’s class, 12 are from Miss White’s class, and 17 are from Ms. Brown’s class.Ms. Brown’s class raised $400 to help put a fence around the playground. The fence cost $15 a yard. How much more money per student would Ms. Brown’s class have to raise to completely fence in the playground?