This year's electricity consumption is 15% less than last year's, and this year's electricity consumption is equivalent to last year's.
今年用电比去年节约15%，今年用电相当于去年的多少．
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 - (3/20)</gadget>
<output>17/20 = around 0.85</output>

<result>17/20 = around 0.85</result>