A sum of money at simple interest amounts to Tk. 815 in 3 years and to Tk. 854 in 4 years. The sum is-

Question: A sum of money at simple interest amounts to Tk. 815 in 3 years and to Tk. 854 in 4 years. The sum is-Solution:Simple interest for 1 year = Tk. (854 - 815)= Tk. 39∴ Simple interest for 3 years = Tk.(39 × 3)= Tk. 117∴ Sum = (815 - 117)= Tk. 698