A chemical fertilizer factory planned to produce 850 tons of fertilizer last year, but in the first half of the year, it completed 54% of the plan, and in the second half of the year, it completed 56% of the plan and 40 tons more. How many tons did it actually exceed?
一个化肥厂计划去年生产化肥850吨，结果上半年完成了计划的54%，下半年完成了计划的56%还多40吨，实际超产多少吨？
<gadget id="calculator">54 / 100</gadget>
<output>27/50 = around 0.54</output>

<gadget id="calculator">56 / 100</gadget>
<output>14/25 = around 0.56</output>

<gadget id="calculator">(14/25) - 1</gadget>
<output>-11/25 = around -0.44</output>

<gadget id="calculator">(27/50) + (-11/25)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">850 * (1/10)</gadget>
<output>85</output>

<gadget id="calculator">85 + 40</gadget>
<output>125</output>

<result>125</result>