The population of a town increases by 20% in the first year and 25% in the second year. In the third year, it decreases by 20%. If the population after three years is 72,000, what was the original population? / किसी नगर की जनसंख्या पहले वर्ष 20% और दूसरे वर्ष 25% बढ़ती है। तीसरे वर्ष इसमें 20% की कमी होती है। यदि तीन वर्षों बाद जनसंख्या 72,000 है, तो प्रारंभिक जनसंख्या कितनी थी?
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. 60,000 / 60,000
Explanation / व्याख्या
Overall multiplier = 1.20 × 1.25 × 0.80 = 1.20. Therefore original population = 72,000/1.20 = 60,000. / कुल गुणक = 1.20 × 1.25 × 0.80 = 1.20। अतः प्रारंभिक जनसंख्या = 72,000/1.20 = 60,000।
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