A person's income increases by 25% while his expenditure increases by 20%. If initially he saved 20% of his income, by what percentage do his savings increase? / एक व्यक्ति की आय में 25% तथा उसके व्यय में 20% की वृद्धि होती है। यदि प्रारंभ में वह अपनी आय का 20% बचाता था, तो उसकी बचत में कितने प्रतिशत की वृद्धि होगी?
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. 45% / 45%
Explanation / व्याख्या
Let original income = 100. Savings = 20 and expenditure = 80. New income = 125 and new expenditure = 80 × 120/100 = 96. New savings = 125 − 96 = 29. Increase in savings = 29 − 20 = 9. Percentage increase = 9/20 × 100 = 45%. / मूल आय 100 मानें। बचत 20 और व्यय 80 होगा। नई आय 125 और नया व्यय 96 होगा। नई बचत = 29। अतः बचत में वृद्धि = 9/20 × 100 = 45%।
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