60 - 15% = 60 * 0.85 = 51
60 - 20% = 60 * 0.8 = 48
60 - 25% = 60 * 0.75 = 45
60 - 75% = 60 * 0.25 = 15
60 - 15% = 60 * 0.85 = 51
60 - 20% = 60 * 0.8 = 48
60 - 25% = 60 * 0.75 = 45
60 - 75% = 60 * 0.25 = 15