100 kg of a fruit with a water content of 90% was shipped from the warehouse. After a week of measurement, the total weight of the fruit is 50 kg. What percentage is the water content of the fruit now?
仓库运来含水量为90%的一种水果100千克，一星期后再测，水果的总重量是50千克，现在水果含水量变为百分之几？
<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">1 - (9/10)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">100 * (1/10)</gadget>
<output>10</output>

<gadget id="calculator">50 - 10</gadget>
<output>40</output>

<gadget id="calculator">40 / 50</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>