The original price of a book is 35 yuan, and now it is on sale with a 20% discount. What is the current price?
一本书原价35元，现在打八折出售，现价多少元．
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">35 * (4/5)</gadget>
<output>28</output>

<result>28</result>