Для того, чтобы найти процентное отношение двух чисел, нужно умножить это отношение на 100%. 1) 21 : 28 * 100% = 21/28 * 100% = 3/4 * 100% = (3 * 100%)/4 = (3 * 25%)/1 = 75%; 2) 13 : 65 * 100% = 13/65 * 100% = 1/5 * 100% = (1 * 100%)/5 = (1 * 20%)/1 = 25%; 3) 36 : 60 * 100% = 36/60 * 100% = 3/5 * 100% = (3 * 100%)/5 = (3 * 20%)/1 = 60%; 4) 54 : 120 * 100% = 54/120 * 100% = 9/20 * 100% = (9 * 100%)/20 = (9 * 5%)/1 = 45%; 5) 117 : 90 * 100% = 117/90 * 100% = 13/10 * 100% = (13 * 100%)/10 = (13 * 10%)/1 = 130%; 6) 105 : 75 * 100% = 105/75 * 100% = 7/5 * 100% = (7 * 100%)/5 = (7 * 20%)/1 = 140%.