The original price of a down jacket is 385 yuan. It is now on sale with a 20% discount. How much is it cheaper than the original price to buy a down jacket like this?
一种羽绒服原价385元．现在八折出售，买一件这样的羽绒服比原价便宜多少元？
<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">385 * (1/5)</gadget>
<output>77</output>

<result>77</result>