Total no. of students - 140 students Total no. of students from all schools= 140+70+35+105=350 school A= 140÷350×100=40./. (multiplying by 100 because it's the total percentage ) School B = 70÷350×100=20./. School C = 105÷350×100=30./. School D = 105÷350×100= 10./. Consisting all the schools percentage it gives 100./.