The price of a commodity is increased by 40%. By what percentage should its consumption be reduced so that the total expenditure increases by only 12%? / किसी वस्तु की कीमत में 40% की वृद्धि होती है। यदि कुल खर्च केवल 12% बढ़ाना हो, तो खपत में कितने प्रतिशत की कमी करनी चाहिए?
Answer and explanation are free to read — no sign-in required. / उत्तर और व्याख्या पढ़ने के लिए साइन-इन आवश्यक नहीं है।
Correct Answer / सही उत्तर
C. 20% / 20%
Explanation / व्याख्या
Price becomes 140% while expenditure should become 112%. Therefore new consumption = 112/140 × 100 = 80% of original consumption. Hence consumption must be reduced by 20%. / कीमत 140% हो जाती है जबकि खर्च 112% होना चाहिए। अतः नई खपत = 112/140 × 100 = 80%। इसलिए खपत में 20% कमी करनी होगी।
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