The fruit warehouse shipped 400 kilograms of a fruit with a water content of 90%. A week later, the water content was found to have dropped to 80%. What is the total weight of this batch of fruit?
水果仓库运来含水量为90%的一种水果400千克，一周后再测，发现水含量降低为80%，现在这批水果的总质量是多少千克？
<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">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/10) / (1/5)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">400 * (1/2)</gadget>
<output>200</output>

<result>200</result>