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A sum of money on simple interest doubles itself in 10 years . It will triple itself in

1. 15
2. 20
3. 30
4. 32

कोई धनराशि साधारण ब्याज पर 10 वर्ष में दुगनी हो जाती है। यह अपने आप में तीन गुना हो जाएगा

1. 15
2. 20
3. 30
4. 32
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UGC-NET-English-01-December-2021-Shift-1-Q22
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Detailed Explanation & Answer
A = P + P * r * t

Determine the Interest Rate:
If the sum of money doubles in 10 years, it means the total amount A is 2P after 10 years.

Substitute into the formula:
2P = P + P * r * 10
2P - P = P * r * 10
P = P * r * 10
r = 1 / 10
r = 0.1 (or 10%)

To find out when the amount will triple, set A to 3P and solve for t.

3P = P + P * r * t
(r = 0.1)
3P = P + P * 0.1 * t
3P - P = 0.1 * P * t
2P = 0.1 * P * t
2 = 0.1 * t
t = 2 / 0.1
t = 20 years
A = P + P * r * t

ब्याज दर निर्धारित करें:
यदि धन राशि 10 वर्षों में दोगुनी हो जाती है, तो इसका मतलब है कि 10 वर्षों के बाद कुल राशि A 2P है।

सूत्र में प्रतिस्थापित करें:
2P = P + P * r * 10
2P - P = P * r * 10
P = P * r * 10
r = 1 / 10
r = 0.1 (या 10%)

यह पता लगाने के लिए कि राशि कब तिगुनी हो जाएगी, A को 3P पर सेट करें और t के लिए हल करें।

3P = P + P * r * t
(r = 0.1)
3P = P + P * 0.1 * t
3P - P = 0.1 * P * t
2P = 0.1 * P * t
2 = 0.1 * t
t = 2 / 0.1
t = 20 वर्ष
So, the sum of money will triple itself in 20 years under simple interest.
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