Example 1: The sixth grade students donated to the "Hope Project". Class Six 1 donated 250 yuan, and Class Six 2 donated 20% more than Class Six 1. How much did the sixth grade donate in total?
例1：六年级学生给"希望工程"捐款，六1班捐款250元，六2班比六1班多捐20%，六年级一共捐款多少元？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">250 * (6/5)</gadget>
<output>300</output>

<gadget id="calculator">300 + 250</gadget>
<output>550</output>

<result>550</result>