During the "June 1st" period, shopping malls held promotional activities, and a schoolbag was sold at a 20% discount. The original price was 80 yuan. How much is it lower than the original purchase?
"六一"期间，商场搞促销让利活动，一个书包八折出售，原价80元，现在购买比原来买降低了多少元？
<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">80 * (1/5)</gadget>
<output>16</output>

<result>16</result>