Question
 A seller offered two successive discounts of 15% and
10% on a smartphone, yet he earned a profit of 18%. Find the approximate cost price of the smartphone if the marked price is Rs. 30,000.Solution
ATQ, Marked price of the smartphone = Rs. 30,000 Selling price of the smartphone = (30000 × 0.85 × 0.90) = Rs. 22,950 Cost price of the smartphone = (22950/118) × 100 = Rs. 19,449.15 or Rs. 19,449
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