Teacher Li counted the donations of the four groups for the "Hope Project": the first, second and third groups donated an average of 24 yuan each, the second, third and fourth groups each donated an average of 26 yuan, and the first group donated 22 yuan, how much does the fourth group donate?
李老师统计了四个小组为"希望工程"的捐款情况：第一组、二组和三组平均每组捐24元，第二、三、四组平均每组捐26元，第一组捐款22元，第四组捐款多少元？
<gadget id="calculator">26 * 3</gadget>
<output>78</output>

<gadget id="calculator">24 * 3</gadget>
<output>72</output>

<gadget id="calculator">72 - 22</gadget>
<output>50</output>

<gadget id="calculator">78 - 50</gadget>
<output>28</output>

<result>28</result>