Question

Sum by simple interest in 3 years become 1040 and 7 years 1360 ,the sum is

Answer 1

1040×1040×1040 =1124864000
$1360 \times 1360 \times 1360 \times 1360 \times 1360 \times 1360 \times 1360$
ans = 8.605425687

and subtract both answers