एक धनराशि 5 वर्षों में 1920 रुपये और 7 वर्षों में 2208 रुपये हो जाती है। तो उस धनराशि के साधारण ब्याज की दर प्रति वर्ष कितनी है?

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ITBP Constable (Animal Transport) 16 Feb 2020 Official Paper
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  1. 10%
  2. 12%
  3. \(12\frac{1}{2}\%\)
  4. \(8\frac{1}{3\%}\)

Answer (Detailed Solution Below)

Option 2 : 12%
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दिया गया है:

5 वर्षों में मिश्रधन = 1920 रुपये

7 वर्षों में मिश्रधन = 2208 रुपये

प्रयुक्त सूत्र:

A = P + (P × r × t)/100

A = मिश्रधन, P = मूलधन, r = दर प्रतिशत, t = समय (वर्षों में)

गणना:

दिये गये अनुसार,

5 वर्षों में मिश्रधन = P + (P × r × 5)/100 = 1920 ----(1)

7 वर्षों में मिश्रधन = P + (P × r × 7)/100 = 2208 ----(2)

(2) में से (1) घटाने पर, हमें प्राप्त होता है:

[P + 7Pr/100] - [P + 5Pr/100] = 2208 - 1920

⇒ 2Pr/100 = 288

⇒ Pr/100 = 288/2

⇒ Pr/100 = 144 ----(3)

(3) का मान (1) में रखने पर:

P + 5Pr/100 = 1920

P + (144 × 5) = 1920

P + 720 = 1920

P = 1920 - 720

P = 1200 ----(4)

अब, (4) का मान (3) में रखने पर:

(1200 × r)/100 = 144

12 × r = 144

r = 144 / 12

r = 12

∴ अभीष्ट दर प्रतिशत 12% है।

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