The current cost is lower than the original (1/10), what is the current cost of the original
现在的成本比原来降低了(1/10)，现在的成本是原来的多少
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<result>9/10 = around 0.9</result>