My sister deposits 800 yuan in the bank for a period of one year, with an annual interest rate of 3.5%. How much interest will I get when it matures?
姐姐把800元钱存入银行，定期1年，年利率是3.5%，到期时要得利息多少元．
<gadget id="calculator">3.5 / 100</gadget>
<output>0.035</output>

<gadget id="calculator">800 * 0.035 * 1</gadget>
<output>28</output>

<result>28</result>