set of clothes used to cost 150 yuan, but now the cost has been reduced by 20% after improving the technology. How much is a suit now?
以前一套衣150元，现在改进技术后成本降低了20%．现在一套衣多少元？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">150 * (4/5)</gadget>
<output>120</output>

<result>120</result>