A leather jacket is now priced at 640 yuan each, which is 20% lower than the original price. How much is the original price?
一种皮衣现在每件售价640元，比原价降低了20%，原价是多少元？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">640 / (4/5)</gadget>
<output>800</output>

<result>800</result>