22 - 6.75 (30% OFF) = ₹15.73

13.33 + 2.40 (18%) = 15.73

• 36 + @ 0% : 19.00 + 18% = 22.42
• 72 + @ 6% : 18.00 + 18% = 21.24
• 108 + @ 11% : 17.00 + 18% = 20.06