A large chemical fertilizer factory planned to produce 45,000 tons of fertilizers for the whole year, but it completed 60% of the annual plan in the first half of the year, and 70% of the annual plan in the second half of the year. How many tons more were actually produced than planned?
一家大型化肥厂，计划全年生产化肥45000吨，但上半年就完成了全年计划的60%，下半年完成了全年计划的70%．实际比计划多生产了多少吨？
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">(7/10) - 1</gadget>
<output>-3/10 = around -0.3</output>

<gadget id="calculator">(3/5) + (-3/10)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">45_000 * (3/10)</gadget>
<output>13_500</output>

<result>13_500</result>