Multiple choice

Jaggu lent out some amount of money at 12% simple interest and an equal amount of money at 8% simple interest for 3 years. If his total interest was Rs.10800, what amount was lent out in each case? जग्गू ने कुछ राशि 12% साधारण ब्याज पर और उतनी ही राशि 8% साधारण ब्याज की दर पर 3 वर्षो के लिए उधार दिया। यदि उसे कुल ब्याज 10800 रु. मिला, तो प्रत्येक स्थिति में कितनी राशि उधार दी गई थी?

  1. 18000

  2. 24000

  3. 12000

  4. 40000

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A Correct answer
Explanation

Let amount lent at each rate = x. Total interest = x×12×3/100 + x×8×3/100 = 36x/100 + 24x/100 = 60x/100 = 3x/5 = 10800. So x = 10800×5/3 = 18000. Each amount lent was Rs. 18000.