During the National Day period, a store has a 20% discount on the whole site. The original price of a product is 618 yuan, how much is it cheaper after the discount?
国庆期间，某商店全场8折优惠．一件商品原价是618元，打折后便宜多少钱？
<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">618 * (1/5)</gadget>
<output>618/5 = around 123.6</output>

<result>618/5 = around 123.6</result>