Sniper Mode: Baniya Logic

1. Terms

• CP (Cost Price): 100% usually.
• SP (Selling Price): CP + Profit or CP - Loss.
• MP (Marked Price): Label price.
• Discount: Always on MP. SP = MP - Discount.
• Profit/Loss %: Always on CP (unless specified).

2. Key Relationships

• Relation between CP and MP:
  • CP / MP = (100 - Discount%) / (100 + Profit%).
  • GOLDEN FORMULA for "Profit even after discount" problems.

3. Problem Types

• Buy X for Y:
  • Buy 5 lemons for Rs 2, Sell 3 lemons for Rs 4.
  • Trick: Cross Multiply. CP of 15 (LCM) lemons = 6. SP of 15 = 20. Profit = 14 on 6.
• False Weight (Dishonest Shopkeeper):
  • Uses 900g instead of 1kg.
  • Profit % = (Error / True Value - Error) * 100.
  • Logic: He is selling 900g money but charging for 1000g. Profit 100g on 900g cost.
• Successive Discount:
  • Two discounts x% and y% = x + y - (xy/100).
  • Buy 2 Get 1 Free: Discount = Free / Total = 1/3 = 33.33%.