A commodity is sold at a 30% discount, the original price is 80 yuan, how much less is the current price than the original price.
一种商品打七折出售，原价80元，现价比原价少多少元．
<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">80 * (7/10)</gadget>
<output>56</output>

<gadget id="calculator">80 - 56</gadget>
<output>24</output>

<result>24</result>