The post office remittance fee is 1% of the remittance amount. Aunt Li remits 4,000 yuan to the post office. How much remittance fee should Aunt Li pay?
邮局汇款费是汇款数的1%，李阿姨到邮局汇款4000元，李阿姨应缴汇费多少元．
<gadget id="calculator">1 / 100</gadget>
<output>1/100 = around 0.01</output>

<gadget id="calculator">4_000 * (1/100)</gadget>
<output>40</output>

<result>40</result>