A table is 55 yuan, which is 30 yuan more expensive than a chair. How much does it cost to buy 10 sets (one table and one chair).
一张桌子55元，比一把椅子贵30元，买10套(一张桌子配一把椅子)要多少元．
<gadget id="calculator">55 - 30</gadget>
<output>25</output>

<gadget id="calculator">55 + 25</gadget>
<output>80</output>

<gadget id="calculator">80 * 10</gadget>
<output>800</output>

<result>800</result>