A project was planned to be completed in 5 days, all (3/8) was completed on the first day, and all (1/4) was completed on the second day. What percentage of the plan was overfulfilled in two days?
一项工程，计划5天完成，第一天完成了全部的(3/8)，第二天完成了全部的(1/4)，两天超额完成了计划的几分之几？
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(1/4) - (2/5)</gadget>
<output>-3/20 = around -0.15</output>

<gadget id="calculator">(3/8) + (-3/20)</gadget>
<output>9/40 = around 0.225</output>

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