सुमन ने 20,000 रुपये की धनराशि प्रति वर्ष 10% चक्रवृद्धि ब्याज पर निवेशित कीयदि n वर्षों बाद उसे 26,620 रुपये की धनराशि प्राप्त हुई, n का मान है:

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RRB Group D 9 Sept 2022 Shift 2 Official Paper
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  1. 2.8 वर्ष
  2. 2.5 वर्ष
  3. 3 वर्ष
  4. 2 वर्ष

Answer (Detailed Solution Below)

Option 3 : 3 वर्ष
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Detailed Solution

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दिया गया:

मूलधन = 20,000 वर्ष

ब्याज दर (r) = 10% प्रति वर्ष

धनराशि = 26,620 रूपये

समय = n वर्ष

प्रयुक्त सूत्र:

धनराशि = मूलधन × {1 +\(\frac{R}{100}\)}समय 

गणना:

प्रश्न के अनुसार,

धनराशि = मूलधन × {1 + \(\frac{R}{100}\)}समय 

⇒ 26,620 = 20,000 × {1 +\(\frac{10}{100}\)}n

⇒ \(\frac{26,620}{20,000}\) = {1 + \(\frac{1}{10}\)}n

⇒ \(\frac{1331}{1000}\) = {\(\frac{11}{10}\)}n

⇒ (\(\frac{11}{10}\))³ = (\(\frac{11}{10}\))n

⇒ n = 3

अतः, n वर्षों का अभीष्ट मान 3 वर्ष है।

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