📘 BANK EXAM SPEED MATHS – PAGE 15

🔹 Profit & Loss Tricks

Profit and Loss is a scoring topic in bank exams. Shortcut methods can help solve these questions quickly without lengthy calculations.

✅ Trick 1: Basic Formula

• Profit = SP − CP
• Loss = CP − SP
• Profit% = (Profit ÷ CP) × 100

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✅ Trick 2: Successive Percentage Change

Formula: Net % = a + b + (ab/100)

Example: +20% and −10%

• = 20 − 10 − (200/100)
• = 8% gain

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✅ Trick 3: Marked Price & Discount

Example: 20% discount on ₹500

• SP = 500 × 0.8 = 400

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🔹 Simple Interest (SI) Tricks

✅ Trick 4: SI Formula

SI = (P × R × T) / 100

Example: P=1000, R=10%, T=2

• SI = 200

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🔹 Compound Interest (CI) Tricks

✅ Trick 5: CI Shortcut (2 Years)

Formula: CI = P(1 + R/100)² − P

Example: P=1000, R=10%

• CI = 1000(1.1² − 1)
• = 1000(1.21 − 1) = 210

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✅ Trick 6: Difference Between CI & SI

For 2 years: Difference = P × (R/100)²

Example: P=1000, R=10%

• Difference = 1000 × (0.1)² = 10

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🔹 Tough Practice Questions

1. CP = 400, SP = 500, find profit %
2. Successive change: +15% and +20%
3. Marked price ₹800, discount 25%, find SP
4. SI on ₹2000 at 5% for 3 years
5. CI on ₹1000 at 10% for 2 years
6. Difference between CI & SI for ₹2000 at 10% for 2 years

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🔹 Quick Answers

• 1. 25%
• 2. 38%
• 3. 600
• 4. 300
• 5. 210
• 6. 20

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🔹 Exam Tips

✔ Use percentage shortcuts instead of long formulas
✔ Memorize CI-SI difference formulas
✔ Focus on shortcut multiplication
✔ Practice real exam-level questions regularly

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