The kindergarten purchased 50 meters of cloth to make performance costumes. If the cloth used for each performance is 2.2 meters, how much rice cloth will be left after making 18 sets?
幼儿园购进50米布做演出服，如果每套演出服用布2.2米，做18套后，还剩下多少米布？
<gadget id="calculator">2.2 * 18</gadget>
<output>39.6</output>

<gadget id="calculator">50 - 39.6</gadget>
<output>10.4</output>

<result>10.4</result>