The original price of a commodity is 70 yuan, and now it is sold at a 20% discount, how much is the price reduction.
一件商品原价70元，现按八折销售，降价多少元．
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">70 * (4/5)</gadget>
<output>56</output>

<gadget id="calculator">70 - 56</gadget>
<output>14</output>

<result>14</result>