The price of a photo album is 12.80 yuan, which is exactly (4/7) the price of 2 dictionaries. How much is the price of each dictionary?
一本相册的价格是12.80元，正好是2本字典价格的(4/7)，求每本字典的价格是多少元？
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">12.8 / (4/7) / 2</gadget>
<output>11.2</output>

<result>11.2</result>