A computer is being promoted and sold at a 20% discount. The price is 6,000 yuan. How much is the promotional price cheaper than the original price?
一台电脑进行促销，按八折出售，价钱是6000元，促销价比原价便宜多少元？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">6_000 / (4/5)</gadget>
<output>7_500</output>

<gadget id="calculator">7_500 - 6_000</gadget>
<output>1_500</output>

<result>1_500</result>