एक राशि को जब चक्रवृद्धि ब्याज पर निवेश किया जाता है तो 2 वर्ष बाद वह 4500 रु हो जाती है और 4 वर्ष बाद वह 6750 रु हो जाती है। राशि ज्ञात कीजिये।

  1. 4000 रु
  2. 2500 रु
  3. 3000 रु
  4. 3050 रु

Answer (Detailed Solution Below)

Option 3 : 3000 रु
Free
RRB NTPC CBT-I Official Paper (Held On: 4 Jan 2021 Shift 1)
100 Qs. 100 Marks 90 Mins

Detailed Solution

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दिया है कि:

एक राशि को जब चक्रवृद्धि ब्याज पर निवेश किया जाता है तो 2 वर्ष बाद वह 4500 रु हो जाती है और 4 वर्ष बाद वह 6750 रु हो जाती है

प्रयुक्त सूत्र:

चक्रवृद्धि ब्याज की स्थिति में:

राशि = P × (1 + R/100)T

जहाँ,

P → मूलधन, R → ब्याज की दर तथा T → समय

गणना:

सूत्र लागू करने पर:

P × (1 + R/100)2 = 4500      ---- (1)

तथा

P × (1 + R/100)4 = 6750      ---- (2)

समीकरणों को विभाजित करने पर:

⇒ (1 + R/100)= 6750/4500

अब, समीकरण 1 से:

P × (6750/4500) = 4500

⇒ P = 3000

∴ राशि रु 3000 है।

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