On May 12, 2008, a catastrophic earthquake occurred in Wenchuan, Sichuan, my country. After the earthquake, people all over the country united as one and donated money one after another. The fourth grade of a certain school donated a total of 8,500 yuan, twice that of the third grade, and the fifth grade donated 150 yuan less than the third grade. How much is the grade donation?
2008年5月12日，我国四川汶川发生特大地震，震后全国人民万众一心，纷纷捐款，某校四年级共捐款8500元，是三年级的2倍，五年级比三年级少捐150元，五年级捐款多少元？
<gadget id="calculator">8_500 / 2</gadget>
<output>4_250</output>

<gadget id="calculator">4_250 - 150</gadget>
<output>4_100</output>

<result>4_100</result>