The sixth grade students donated 500 yuan to the disaster area, the fifth grade students donated the sixth grade (4/5), and the fourth grade students donated the fifth grade (9/8). How much did the fourth grade students donate?
六年级同学为灾区捐款500元，五年级同学捐的是六年级的(4/5)，四年级同学捐的是五年级的(9/8)．四年级同学捐款多少元？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">9 / 8</gadget>
<output>9/8 = around 1.125</output>

<gadget id="calculator">500 * (4/5) * (9/8)</gadget>
<output>450</output>

<result>450</result>