In order to celebrate Children's Day, Xinhua Bookstore sells children's books at a 20% discount. Xiaowen's mother gives her 50 yuan to buy books. If she buys two of the following books, how much money does Xiaowen have left? Please be Xiaowen's "Book Buying Consultant". "Baby Learning Computer" 15 yuan; "Children's Animal World" 18.8 yuan; "Andersen's Fairy Tales" (Part 1, Part 2) 38 yuan.
为了庆祝"六一"儿童节，新华书店儿童图书一律八折出售．小雯的妈妈给她50元去买书，如果购下列图书中的两种，小雯还剩多少元？请你为小雯做"买书参谋"．《娃娃学电脑》15元；《少儿动物大世界》18.8元；《安徒生童话》(上、下)共38元．
<gadget id="calculator">18.8 + 38</gadget>
<output>56.8</output>

<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">56.8 * (4/5)</gadget>
<output>45.44</output>

<gadget id="calculator">50 - 45.44</gadget>
<output>4.56</output>

<result>4.56</result>