There are three kinds of books A, B, and C. The price of 4 books of type A is equal to the price of 3 books of type B. The price of 4 books of type B is equal to the price of 3 books of type C. Each book of type C is 1.4 more expensive than that of book A. Yuan, how much is a book of Type A?
有甲、乙、丙三种书，甲种书4本价钱等于乙种书3本的价钱，乙种书4本的价钱等于丙种书3本的价钱，丙种书每本比甲种书贵1.4元，甲种书多少元一本？
<gadget id="calculator">1.4 * 9</gadget>
<output>12.6</output>

<gadget id="calculator">16 - 9</gadget>
<output>7</output>

<gadget id="calculator">12.6 / 7</gadget>
<output>1.8</output>

<result>1.8</result>