A sum of money at simple interest amounts to Rs. 810 in 3 years and to Rs. 850 in 4 years. The sum is
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → 690
Under simple interest the interest is the same every year, so the rise in the amount from one year to the next is one year’s interest.
Interest for 1 year \(=850-810=\) Rs. 40 (amount after 4 years minus amount after 3 years)
Interest for 3 years \(=3\times40=\) Rs. 120
Sum \(=810-120=\) Rs. 690