Question

In how much time would Rs 5000 amount to Rs 6655 at $10$% p.a compound interest?

Answer 1

$5000(1+10/100{)}^n=6655$
$(11/10{)}^n=6655/5000$
$(11/10{)}^n=1331/1000$
$(11/10{)}^n=(11/10{)}^3$
$n=3$