What is the perimeter of a rectangle with a length of 80 cm and a width of 10 cm?
长80厘米，宽10厘米的长方形，它的周长是多少厘米．
<gadget id="calculator">80 + 10</gadget>
<output>90</output>

<gadget id="calculator">90 * 2</gadget>
<output>180</output>

<result>180</result>