The school cafeteria originally used 4,200 pairs of disposable chopsticks every week, and each pair of chopsticks was 0.03 yuan. Now the school cafeteria does not use disposable chopsticks, how much money can be saved in a week?
学校食堂原来每周要用掉4200双一次性筷子，每双筷子0.03元．现在学校食堂不用一次性筷子了，一周可节约多少钱？
<gadget id="calculator">4_200 * 0.03</gadget>
<output>126</output>

<result>126</result>