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A person sold his pen for Rs 24 and his profit percentage was numerically equal to the cost price. What was the cost price (in Rs) of the pen?1). 122). 143). 164). 20 |
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Answer» Let the cost price and profit PERCENTAGE be y From the PROBLEM’s statement ⇒ y × (1 + y/100) = 24 ⇒ y2 + 100y - 2400 = 0 ⇒ (y – 20) (y + 120) = 0 Since y can’t be negative so y = 20 is the required solution ∴ the profit percentage and cost price be 20 |
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