A jacket with a price tag of 600 yuan can still make a profit of 20 yuan if it is sold at a 20% discount. How much does this coat cost?
一件标价为600元的上衣，按八折销售仍可获利20元．这件上衣的成本是多少元．
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">600 * (4/5)</gadget>
<output>480</output>

<gadget id="calculator">480 - 20</gadget>
<output>460</output>

<result>460</result>