You deposit <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> ₹4000 in a bank account at 9% simple interest per year. How much interest would you have earned after 4 years?
<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> ₹1440
S.I=P×T×R100
S.I=4000×4×9100
S.I=₹1440.