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Q29. A shopkeeper purchases a set of a certain number of erasers at 4 per rupee and another set of the same number of erasers at 5 per rupee. She mixes the erasers and sells them at 4 per rupee. What is her gain or loss percent?

एक दुकानदान 4 रबड़ प्रति रू. की दर से रबड़ का एक सेट खरीदती है और उतनी ही रबड़ का दूसरा सेट वह 5 रबड़ प्रति रू. की दर से खरीदती है। वह दोनों सेटों को मिला देती है और उन्हें 4 रबड़ प्रति रू. की दर से बेचती है। उसके लाभ या हानि का % क्या है?


A

91/11 % gain

91/11 % लाभ

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B

91/11 % loss

91/11 % हानि

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C

100/9 % gain

100/9 % लाभ

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D

100/9 % loss

100/9 % हानि

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Solution

The correct option is C

100/9 % gain

100/9 % लाभ


Cost price of first set of erasers = Rs. 1/4 per eraser

Cost price of second set of erasers = Rs. 1/5 per eraser

After mixing, cost price of each eraser = ½ (1/4 +1/5) = Rs. 9/40

As per question, selling price of one eraser after mixing = Rs. 1/4

Gain percentage = [(selling price - cost price)/ cost price] × 100= [(1/4 - 9/40)/(9/40)] × 100= 100/9%

रबड़ के पहले सेट का क्रय मू. = 1/4 रू. प्रति रबड़

रबड़ के दूसरे सेट का क्रय मू. = 1/5 रू. प्रति रबड़

देनों को मिलाने के बाद, प्रत्येक रबड़ का क्रय मू. = 1/2 (1/4 + 1/5) = 9/40 रू.

प्रश्नानुसार, मिलाने के बाद एक रबड़ का विक्रय मूल्य = 1/4 रू.

लाभ प्रतिशत = [(विक्रय मू.- क्रय मू.)/क्रय मू.] × 100 = [(1/4 – 9/40)/(9/40)] × 100 = 100/9 प्रतिशत


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