Stores A and B are conducting promotional activities at the same time, and all products in store A will be discounted by 20%; store B will offer a cash discount, and if you spend over 200 yuan, you will get back 50 yuan in cash. Xiaoyu wants a bicycle priced at 200 yuan, which store is cheaper to buy? How much is it cheaper?
甲、乙两商店同时搞促销活动，甲商店所有的商品一律打八折；乙商店实行现金优惠，消费满200元返回现金50元．小雨想要一辆售价200元的自行车，在哪个商店购买更便宜？便宜了多少元？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">200 * (4/5)</gadget>
<output>160</output>

<gadget id="calculator">200 - 50</gadget>
<output>150</output>

<gadget id="calculator">160 - 150</gadget>
<output>10</output>

<result>10</result>