A kind of sweater, the original price is 56 yuan, the current price is lower than the original price (2/7), how much is the current price reduction than the original price.
一种毛衣，原价56元，现在的价钱比原来降低了(2/7)，现在比原来降价多少元．
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">56 * (2/7)</gadget>
<output>16</output>

<result>16</result>