Class 61 donated 500 yuan, Class 62 donated less than Class 61 (4/5), how much did Class 62 donate?
六一班捐款500元，六二班比六一班少捐了(4/5)，六二班捐款多少元？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">500 * (1/5)</gadget>
<output>100</output>

<result>100</result>