Xinhua Bookstore "Children's Encyclopedia" originally priced at 160 yuan per set, and now the bookstore is celebrating a sale, and all books are sold at a 20% discount. How many sets of this book can you buy for the original price of 16 sets? (Solve with ratio)
新华书店《少儿百科全书》原价每套160元，现书店店庆促销，所有的书均按八折出售，原来买16套这书的钱现在可以买几套？(用比例解)
<gadget id="calculator">160 * 16</gadget>
<output>2_560</output>

<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">2_560 / 128</gadget>
<output>20</output>

<result>20</result>