The handkerchief factory originally planned to produce 3,280 dozen handkerchiefs in August. After adopting the new production line, 2,960 dozens of handkerchiefs were shipped out, leaving 875 dozen. How many dozens more than the original plan?
手帕厂原计划八月份生产手帕3280打．采用新的生产流水线后，生产的手帕运走了2960打，还剩875打．比原来计划增产多少打？
<gadget id="calculator">875 - 3_280</gadget>
<output>-2_405</output>

<gadget id="calculator">2_960 + (-2_405)</gadget>
<output>555</output>

<result>555</result>