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Test yourself with exam-pattern MCQs before reading. Spot your weak points, then crush the notes.
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The Cheat Formula
When a question only gives you percentages (e.g., "A profit of 20% is made..."), stop using "x". Assume the Cost Price is 100. It makes the math incredibly easy and saves about 30–40 seconds per question.
Don't calculate discounts one by one. Use the effective discount formula:
$$ \text{Effective Discount} = a + b - \frac{ab}{100} $$
Example: 10% and 20% off → 10 + 20 - 2 = 28% total discount.
If Profit % = Discount %, use the square rule to find MP quickly.
Always check if "Cost Price is an Integer"—it helps eliminate 2–3 options immediately.
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