650 - 130.00 (20% OFF) = ₹520.00

440.68 + 79.32 (18%) = 520.00

• 20 + @ 24% : 418.64 + 18% = 494.00
• 40 + @ 28% : 396.61 + 18% = 468.00
• 60 + @ 32% : 374.58 + 18% = 442.00