Xinhua Bookstore is running a promotional event, all children's books are sold at a 20% discount. Lingling bought some children's books and spent a total of 88 yuan. How much cheaper than the original price.
新华书店搞促销活动，儿童图书一律八折出售．玲玲购买了一些儿童图书，共花了88元．比原价便宜了多少元．
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">88 / (4/5)</gadget>
<output>110</output>

<gadget id="calculator">110 - 88</gadget>
<output>22</output>

<result>22</result>