840 - 84.00 (10% OFF) = ₹756.00

640.68 + 115.32 (18%) = 756.00

• 4 + @ 15% : 608.65 + 18% = 718.20
• 8 + @ 19% : 576.61 + 18% = 680.40
• 12 + @ 24% : 544.58 + 18% = 642.60