During the New Year's Day period, the whole store in "China Merchants Department Store" has a 15% discount. Mom has taken a fancy to a set of clothes with an original price of 580 yuan. If she buys it, how much does she need to prepare?
元旦期间，"中商百货"里全场打八五折．妈妈看中了一套原价580元的衣服，如果购买，她需要准备多少钱？
<gadget id="calculator">85 / 100</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">580 * (17/20)</gadget>
<output>493</output>

<result>493</result>