788 - 157.60 (20% OFF) = ₹630.40

534.24 + 96.16 (18%) = 630.40

• 4 + @ 24% : 507.53 + 18% = 598.88
• 8 + @ 28% : 480.81 + 18% = 567.36
• 12 + @ 32% : 454.10 + 18% = 535.84