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Sellling 12 pen at a price of Tk 10 yields a loss of a% Selling 12 pen at a price of Tk 12 yields a profit of a%. What is the value of a?

Sellling 12 pen at a price of Tk 10 yields a loss of a% Selling 12 pen at a price of Tk 12 yields a profit of a%. What is the value of a? Correct Answer 10011

প্রশ্নমতে, 10 × 100100 - a = 12 × 100100 + a⇒ 10 × 100100 - a = 12 × 100100 + a⇒ 10100 - a = 12100 + a⇒ 1000 + 10a = 1200 - 12a⇒ 10a + 12a = 1200 - 1000⇒ 22a = 200⇒ a = 20022 = 10011

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