14. (7 points) Xiaohong went to the stationery store and bought 4 pencils and 5 notebooks, spending a total of 15 yuan 8 jiao. Xiaoliang bought the same 4 pencils and 7 notebooks, spending a total of 21 yuan 8 jiao. What is the price of 1 notebook?
【Answer】Solution: $(21.8-15.8) \div(7-5)$
$$
\begin{array}{l}
=6 \div 2 \\
=3 \text { (yuan) }
\end{array}
$$

Answer: Each exercise book costs 3 yuan.