Students from Huishan Primary School donated money to the children in the disaster area. The fourth grade donated 500 yuan, the fourth grade donated more than the fifth grade (1/4), the fifth grade donated more than the sixth grade (1/3). How much is the sixth grade donation?
会山小学同学给灾区的小朋友捐款．四年级捐了500元，四年级捐的比五年级多(1/4)，五年级捐的比六年级多(1/3)．六年级捐款多少元．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 + (1/3)</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">500 / (5/4) / (4/3)</gadget>
<output>300</output>

<result>300</result>