My mother took a fancy to a 540 yuan coat in the mall and bought it at a 20% discount. How much money can my mother save?
妈妈在商场看中了一件540元的大衣，按八折购买，妈妈能省多少元钱．
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">540 * (1/5)</gadget>
<output>108</output>

<result>108</result>