Multiple choice

The simple interest on a sum of money will be Rs. 4200 after 8 years. If the principal is doubled after three years, what will be the total interest at the end of 8 years?

  1. Rs. 6825

  2. Rs. 8400

  3. Rs. 9975

  4. Rs. 5250

  5. None of these
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A Correct answer
Explanation

Let the money be p and the rate be r.

Then, p*r*8 = 4200*100            p*r = 52500 Now, for 3 years, SI = p*r*3/100             = 52500*3/100 = 1575 For the next 5 years, money is 2p. So, SI = 2p*r*5/100 = p*r/10             = 52500/10 = 5250 Total SI = 1575+5250 = 6825

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