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Question

Q. Ravi lent Rs. 400 to Ashok for 2 years, and Rs. 100 to Mukesh for 4 years and received togher from both Rs. 60 as interest. FInd the rate of interest (Simple Interest), being calculated.

Q. रवि ने अशोक को 2 साल के लिए 400 रु और मुकेश को 4 साल के लिए 100 रुपये उधार दिए और दोनों से ब्याज के रूप में उसे 60 रुपए प्राप्त हुए। ब्याज की दर (साधारण ब्याज) ज्ञात करें।

A
5%
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B
6%
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C
7%
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D
8%
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Solution

The correct option is A 5%

Method 1:

Total effective amount lent for 1 year =(400×2)+(100×4)=1200

The interest being Rs. 60, Rate of interest =(60×100)1200=5%

Method 2:

Let the interest in the first case =x=(400×2× r)100.

Thus, 8r=x(1)

Similarly, (60x=(100×4× r)100.

Thus, 4r=60x(2)

Adding (1) and (2) , r=5%

विधि 1:

1 वर्ष के लिए उधार की कुल राशि =(400×2)+(100×4)=1200

ब्याज के रूप में प्राप्त राशि 60 रुपए है, तो ब्याज दर =(60×100)1200=5%

विधि 2:

माना पहले मामले में ब्याज दर =x=(400×2× r)100.

इस प्रकार, 8r=x(1)

इसी प्रकार, (60x=(100×4× r)100.

इस प्रकार, 4r=60x(2)

समीकरण (1) और (2) को जोड़ने पर, r=5%


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