Department stores hold promotional activities. Brand A shoes get 100 yuan off when they spend 200 yuan, and brand B shoes are "discounted up". If two brands have a pair of shoes with a price tag of 260 yuan, which brand is cheaper? How much cheaper?
百货大楼搞促销活动，甲品牌鞋满200减100元，乙品牌鞋"折上折"，就是先打七折，在此基础上再打八五折．如果两个品牌都有一双标价260元的鞋，哪个品牌的更便宜？便宜多少钱？
<gadget id="calculator">260 - 100</gadget>
<output>160</output>

<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">85 / 100</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">260 * (7/10) * (17/20)</gadget>
<output>1_547/10 = around 154.7</output>

<gadget id="calculator">160 - (1_547/10)</gadget>
<output>53/10 = around 5.3</output>

<result>53/10 = around 5.3</result>