A certain sum of money at simple interest amounted Rs.840 in 10 years at 3% per annum, find the sum?
Choose the correct choice from the following:  A) 378  B) 277  C) 299  D) 646  E) 261
840 = P [1 + (10*3)/100]   P = 646   Answer: 646
<result>D</result>
A certain sum of money at simple interest amounted Rs.840 in 10 years at 3% per annum, find the sum?