The garment factory's production of garments in the first half of the month accounts for (3/5) of the full-month plan, and the production of garments in the second half of the month accounts for (5/8) of the full-month plan. What percentage of the plan was overfulfilled in the whole month?
服装厂上半月生产服装占全月计划的(3/5)，下半月生产服装占全月计划的(5/8)．全月超额完成计划的几分之几？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">(5/8) - 1</gadget>
<output>-3/8 = around -0.375</output>

<gadget id="calculator">(3/5) + (-3/8)</gadget>
<output>9/40 = around 0.225</output>

<result>9/40 = around 0.225</result>