Guangming Primary School buys 8 footballs and 8 volleyballs each. It is known that a football is 55 yuan and a volleyball is 42 yuan. How much more does it cost to buy football than volleyball?
光明小学买足球、排球各8个．已知一个足球55元，一个排球42元．买足球比排球多用多少元？
<gadget id="calculator">55 * 8</gadget>
<output>440</output>

<gadget id="calculator">42 * 8</gadget>
<output>336</output>

<gadget id="calculator">440 - 336</gadget>
<output>104</output>

<result>104</result>