The original price of a down jacket is 450 yuan, and now it is sold at a 20% discount. How much does it cost to buy such a down jacket?
一件羽绒服原价450元，现在八折出售，买一件这样的羽绒服需要多少元？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">450 * (4/5)</gadget>
<output>360</output>

<result>360</result>