Books in the bookstore can get a 20% discount with the discount card. Linlin bought a set of books with the discount card and saved 6.6 yuan. How much is the original price of this book.
书店的图书凭优惠卡可打八折，琳琳用优惠卡买了一套书，省了6.6元．这套书原价多少元．
<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">6.6 / (1/5)</gadget>
<output>33</output>

<result>33</result>