The store ships back 1000 kilograms of fruit, sells 28% of the total on the first day, and sells 30% of the total on the second day, how many kilograms of fruit are left?
商店运回1000千克水果，第一天卖出总数的28%，第二天卖出总数的30%，还剩下多少千克水果？
<gadget id="calculator">28 / 100</gadget>
<output>7/25 = around 0.28</output>

<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (7/25) - (3/10)</gadget>
<output>21/50 = around 0.42</output>

<gadget id="calculator">1_000 * (21/50)</gadget>
<output>420</output>

<result>420</result>