A shopping mall sells discounts. It is stipulated that the purchase of products below 200 yuan will not be discounted, and all products between 200 and 500 yuan will be discounted by 10%. A 20% discount is given for the excess. One person bought two products and spent 134 yuan and 466 yuan respectively. How much more yuan can you save if you buy it once?
一个商场打折销售，规定购买200元一下的商品不打折，200元到500元的商品全部打九折，如购买500元以上的商品，就把500元以内(含500元)的打九折，超出的打八折，一个人买了两次商品，分别用了134元和466元，那么一次购买的话可以再节省多少元？
<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">134 * (1/5)</gadget>
<output>134/5 = around 26.8</output>

<result>134/5 = around 26.8</result>