Ex.2. A man purchased 150 pens at t...
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Ex.2. A man purchased 150 pens at the rate of 12 per pen. He sold 50 pens at a gain of 10%. The percentage gain at which he must sell the re- maining pens so as to gain 15% on the whole outlay is (1) 21% (2) 20% (3) 17% (4) 17+%

11th - 12th Class
Maths
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sol. (4) Required S.P. of 150 pens. ( =150 times 12 times frac{115}{100}=₹ 2070 ) S.P. of first 50 pens ( =frac{50 times 12 times 110}{100}=₹ 660 ) ( therefore ) Required S.P. of 100 pens ( =2070-660=₹ 1410 ) C.P. of 100 pens ( =₹ 1200 ) ( therefore ) Gain per cent ( =frac{210}{1200} times 100 ) ( =frac{35}{2}=17 frac{1}{2} % )
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