For a project, the actual cost is 90.5% of the plan, which is much less than the plan.
一项工程，实际造价是计划的90.5%，比计划节约了多少．
<gadget id="calculator">90.5 / 100</gadget>
<output>0.905</output>

<gadget id="calculator">1 - 0.905</gadget>
<output>0.095</output>

<result>0.095</result>