Lesson 2.5: Profit & Loss, Discount, Simple & Compound Interest

Description:
Commercial math questions like profit, loss, and interest calculations are common in Railway exams.

Key Topics:

• Shortcuts & Formulas:

  • Profit % = (Profit/Cost Price) × 100.

  • CI formula: A = P(1+R/100)ⁿ.

• Practice Examples:

  • A sells an item for ₹120 at 20% profit. Find CP.
    CP = (SP × 100)/(100+Profit%) = (120×100)/120 = ₹100.