There is a kind of clothes in the store. The original price is 40 yuan each, but after the price reduction, each piece is only sold for 34 yuan. How much is it cheaper?
商店有一种衣服，原价每件40元，降价后每件只卖34元，便宜了百分之几？
<gadget id="calculator">40 - 34</gadget>
<output>6</output>

<gadget id="calculator">6 / 40</gadget>
<output>3/20 = around 0.15</output>

<result>3/20 = around 0.15</result>