The road construction team built a 1,000-meter-long road, and 30% of it has been repaired. How many meters will be repaired to exactly half of the total length?
修路队修一条长1000米的公路，已修了30%，再修多少米恰好修了全长的一半？
<gadget id="calculator">1_000 / 2</gadget>
<output>500</output>

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

<gadget id="calculator">1_000 * (3/10)</gadget>
<output>300</output>

<gadget id="calculator">500 - 300</gadget>
<output>200</output>

<result>200</result>