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 options
A) 337
B) 299
C) 277
D) 646
E) 271
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?