Question

Q: A sum of money at simple interest amounts to rs 815 in 3years and to rs 854 in 4years. The sum is ? I NEED COMPLETE SOLUTION PLS HELP ME

a) 650 b) 690 c) 698 d) 700

Answer 1

$amount \: in \: 3 \: years \: = 815 \\ amount \: in \: 4 \: years \: = 854 \\ interest \: in \: 1 \: year \: = 854 - 815 \: = 39 \\ interest \: in \: 3 \: years \: = 39 \times 3 = 117 \\ principal \: = 815 - 117 = 698$