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If the interest received by F is 20% of the sum invested by him then how much more money as interest he would have eamed if he had invested the money in compound interest?

1. Rs 700
2. Rs 600
3. Rs 300
4. Rs 400

यदि F द्वारा प्राप्त ब्याज उसके द्वारा निवेश की गई राशि का 20% है, तो यदि उसने चक्रवृद्धि ब्याज में पैसा निवेश किया होता तो उसे ब्याज के रूप में कितनी अधिक धनराशि प्राप्त होती?

1. 700 रुपये
2. 600 रुपये
3. 300 रुपये
4. 400 रुपये
This Question came in
UGC-NET-MassCom-13-December-2023-Shift-2-Q4
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Detailed Explanation & Answer
Given Information:
The interest received by F is 20% of the sum invested by him.
This means the interest is calculated using Simple Interest (SI).


Simple Interest (SI): SI = (P × R × T) / 100,
Compound Interest (CI): CI = P × (1 + R/100)^T - P.

Interpreting "Interest is 20% of the invested sum":
This means SI = 0.2 × P.
Using the formula for SI: 0.2 × P = (P × R × T) / 100
=> R × T = 20

Let’s assume T = 2 years (a standard case for such problems).
CI = P × (1 + R/100)^2 - P.
CI = P × (1 + 2R/100 + (R/100)^2) - P.
CI = P × (2R/100 + (R^2/100^2)).

Substituting R = 10% (as R × T = 20 and T = 2):

CI = P × (0.2 + 0.01) = P × 0.21.
SI = P × 0.2.

Extra Amount = CI - SI = 0.21P - 0.2P = 0.01P.

If P = Rs 6000, SI = 0.2 × 6000 = Rs 1200.

Extra interest = 0.01 × 6000 = Rs 600.
दी गई जानकारी:
F द्वारा प्राप्त ब्याज उसके द्वारा निवेश की गई राशि का 20% है।
इसका मतलब है कि ब्याज की गणना साधारण ब्याज (एसआई) का उपयोग करके की जाती है।


साधारण ब्याज (एसआई): SI = (P × R × T) / 100,
चक्रवृद्धि ब्याज (सीआई): सीआई = CI = P × (1 + R/100)^T - P.

"ब्याज निवेशित राशि का 20% है" की व्याख्या:
इसका मतलब है SI = 0.2 × P.
एसआई के लिए सूत्र का उपयोग करना: 0.2 × P = (P × R × T) / 100
=> R × T = 20

आइए मान लें कि T = 2 वर्ष (ऐसी समस्याओं के लिए एक मानक मामला)।
CI = P × (1 + R/100)^2 - P.
CI = P × (1 + 2R/100 + (R/100)^2) - P.
CI = P × (2R/100 + (R^2/100^2)).

R = 10% प्रतिस्थापित करने पर (R × T = 20 और T = 2 के रूप में):

CI = P × (0.2 + 0.01) = P × 0.21.
SI = P × 0.2.

अतिरिक्त राशि = CI - SI = 0.21P - 0.2P = 0.01P.

यदि P = 6000 रुपये, SI = 0.2 × 6000 = 1200 रुपये।

अतिरिक्त ब्याज = 0.01 × 6000 = 600 रुपये।
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