A piece of furniture is 1,500 yuan, how much cheaper than the original after a 10% discount.
一件家具1500元，打九折后比原来便宜了多少元．
<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">1 - (9/10)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1_500 * (1/10)</gadget>
<output>150</output>

<result>150</result>