The original price of a bicycle is 800 yuan. Shopping mall A offers a 20% discount on top of the 20% discount, and shopping mall B sells it at a 35% discount. Which shopping mall is the cheapest? How much cheaper?
一辆自行车原价800元，甲商场在打八折的基础上再打八折，乙商场打六五折出售，哪个商场买的便宜？便宜多少钱？
<gadget id="calculator">65 / 100</gadget>
<output>13/20 = around 0.65</output>

<gadget id="calculator">800 * (13/20)</gadget>
<output>520</output>

<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">800 * (4/5) * (4/5)</gadget>
<output>512</output>

<gadget id="calculator">520 - 512</gadget>
<output>8</output>

<result>8</result>