I bought 8 table tennis balls and 8 badminton balls for a total of 16.8 yuan. Each badminton is 1.1 yuan, how much is each table tennis ball?
买乒乓球和羽毛球各8个，共花了16.8元．羽毛球每个1.1元，每个乒乓球多少钱？
<gadget id="calculator">16.8 / 8</gadget>
<output>2.1</output>

<gadget id="calculator">2.1 - 1.1</gadget>
<output>1</output>

<result>1</result>