Multiple choice

A sum of money invested at simple interest amounts to Rs. 815 in 3 years and to Rs. 854 in 4 years. What is the principal sum?

  1. 685

  2. 698

  3. 238

  4. 679

  5. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Simple interest for 1 year = 854 - 815 = 39. Interest for 3 years = 3 * 39 = 117. Principal = 815 - 117 = 698.

AI explanation

The simple interest for one year is the difference between the amounts after 4 years and 3 years, which is 854 minus 815, giving an annual interest of 39. The total simple interest for 3 years is 39 multiplied by 3, equaling 117. Subtracting this interest from the 3-year amount gives the principal: 815 minus 117 equals 698.

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