Seven classes in the sixth grade of Jiayi Primary School carried out tree planting activities, with an average of 216 trees planted per class. It is known that the first four classes planted an average of 235 trees per class, and the last four classes planted an average of 200 trees per class. How many trees were planted by the fourth class of the sixth grade Tree.
佳一小学六年级七个班开展植树活动，平均每班植树216棵，已知前四个班平均每班植树235棵，后四个班平均每班植树200棵，则六年级四班植树多少棵．
<gadget id="calculator">235 * 4</gadget>
<output>940</output>

<gadget id="calculator">200 * 4</gadget>
<output>800</output>

<gadget id="calculator">940 + 800</gadget>
<output>1_740</output>

<gadget id="calculator">216 * 7</gadget>
<output>1_512</output>

<gadget id="calculator">1_740 - 1_512</gadget>
<output>228</output>

<result>228</result>