paid 100 yuan in advance for the telephone bill last month. The monthly telephone fee is 18.00 yuan, the local call fee is 21.44 yuan, and the domestic long-distance fee is 50.56 yuan. How much money is left?
上月我预交话费100元．电话月租费18.00元，本地通话费21.44元，国内长途费50.56元．还剩多少钱？
<gadget id="calculator">100 - 18 - 21.44 - 50.56</gadget>
<output>10</output>

<result>10</result>