20 - 4.00 (20% OFF) = ₹16.00

13.56 + 2.44 (18%) = 16.00

• 12 + @ 24% : 12.88 + 18% = 15.20
• 24 + @ 28% : 12.20 + 18% = 14.40
• 36 + @ 32% : 11.53 + 18% = 13.61