In March, electricity consumption was saved by 45% compared with April, and the electricity consumption in March is equivalent to that in April.
三月份比四月份节约用电45%，三月份用电相当于四月份的多少．
<gadget id="calculator">45 / 100</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">1 - (9/20)</gadget>
<output>11/20 = around 0.55</output>

<result>11/20 = around 0.55</result>