A LCD TV costs 6,500 yuan. If it is sold at a 20% discount, how much is the discount?
一台液晶电视6500元，若打八折出售，可优惠多少元？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">6_500 * (4/5)</gadget>
<output>5_200</output>

<gadget id="calculator">6_500 - 5_200</gadget>
<output>1_300</output>

<result>1_300</result>