Classes of six years insure 40 students with "Ping An Insurance", the insurance amount is 500 yuan per person, and the insurance period is one year. Calculated according to the insurance premium rate of 0.4%, how much is the insurance premium payable by the school.
六年一班为40名学生投保"平安保险"，保险金额为每人500元，保险期限为一年．按照保险费率0.4%计算，学校应付保险费多少元．
<gadget id="calculator">0.4 / 100</gadget>
<output>0.004</output>

<gadget id="calculator">500 * 0.004 * 40</gadget>
<output>80</output>

<result>80</result>