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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 रुपये और मुकेश को 4 साल के लिए 100 रुपये दिए और दोनों से ब्याज के रूप में 60 रुपये प्राप्त किए।ब्याज दर (साधारण ब्याज) की गणना 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 कुल प्रभावी उधार राशि =(400×2)+(100×4)=1200
60 रु ब्याज दर पर ब्याज =(60×100)1200=5%

विधि 2:
माना पहले मामले में ब्याज =x=(400×2×r)100
इस प्रकार, 8r=x(1)
इसी तरह, 60x=(100×4×r)100
इस प्रकार, 4r=60x(2)
समीकरण (1) और (2) को जोड़ने पर r=5%

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