Xinxing Garment Factory planned to process 450 sets of garments in December, but completed the plan (4/5) in the first half of the month, and completed 60% of the plan in the second half of the month. How many more sets were processed this month than the original plan?
新星服装厂十二月份计划加工服装450套，结果上半月完成计划的(4/5)，下半月完成计划的60%，这个月比原计划多加工多少套？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(3/5) - 1</gadget>
<output>-2/5 = around -0.4</output>

<gadget id="calculator">(4/5) + (-2/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">450 * (2/5)</gadget>
<output>180</output>

<result>180</result>