On June 1st, Xinhua Bookstore held a sales promotion, and all books were sold at 20% off the original price. Xiao Ming bought a set of "Ocean World" series with an original price of 160 yuan. How much is it cheaper than the original price after the discount?
六一节那天，新华书店举行促销活动，所有书按原价打八折出售．小明买了一套原价是160元的《海洋世界》丛书，打折后比原价便宜多少元？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">160 * (4/5)</gadget>
<output>128</output>

<gadget id="calculator">160 - 128</gadget>
<output>32</output>

<result>32</result>