42 - 8.40 (20% OFF) = ₹33.60

28.47 + 5.13 (18%) = 33.60

• 40 + @ 24% : 27.05 + 18% = 31.92
• 80 + @ 28% : 25.63 + 18% = 30.24
• 120 + @ 32% : 24.20 + 18% = 28.56