The original price of a jacket in a shopping mall is 140 yuan, and now it is 30% off, how much less can you pay.
某商场一件上衣原价是140元，现在打七折，可以少付多少元．
<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">1 - (7/10)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">140 * (3/10)</gadget>
<output>42</output>

<result>42</result>