Multiple choice

A certain principal at certain rate of simple interest for certain time gives a certain interest. The principal is increased by 30%, rate is made 80% of the previous rate and time duration is made 140% of the previous. In this way, the simple interest received is Rs.910. What is the difference of interest received in the first condition to the interest received at second condition?

  1. Rs.285

  2. Rs.254

  3. Rs.135

  4. Rs.235
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A Correct answer
Explanation

Let original principal P, rate R, time T. Original interest I = P×R×T/100. New values: 1.3P, 0.8R, 1.4T. New interest = 1.3×0.8×1.4×I = 1.456I. Given new interest = Rs.910, so I = 910/1.456 = 625. Difference = 910 - 625 = 285.

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