In the donation activity for the Indian Ocean earthquake and tsunami-stricken areas, the fifth grade students donated a total of 480 yuan, 20% less than the sixth grade. How much did the sixth grade students donate?
在为印度洋地震海啸灾区捐款活动中，五年级同学共捐款480元，比六年级少捐20%．六年级同学捐款多少元？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">480 / (4/5)</gadget>
<output>600</output>

<result>600</result>