There are 49 people in Class 4 and Class 3, and each person donated an average of 3 yuan. How much is the total donation of Class 4 and Class 3?
四3班有49人，平均每人捐款3元，四3班一共捐款多少元．
<gadget id="calculator">49 * 3</gadget>
<output>147</output>

<result>147</result>