Hongda Road in Xiaoshan was widened from the original 40 meters to 60 meters due to the opening of Airport Road. By what percentage?
萧山宏达路由于机场路通车需要，由原来的40米拓宽到60米，拓宽了百分之几？
<gadget id="calculator">60 - 40</gadget>
<output>20</output>

<gadget id="calculator">20 / 40</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>