In a charity donation event, the sixth grade students donated 390 yuan, which was 30% more than the fifth grade. How much did the fifth grade donate?
一次爱心捐款活动中，六年级同学捐了390元，比五年级多捐了30%，五年级捐款多少元？
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 + (3/10)</gadget>
<output>13/10 = around 1.3</output>

<gadget id="calculator">390 / (13/10)</gadget>
<output>300</output>

<result>300</result>