The Following Data Relate to a Company That Produces and Sells

The following data relate to a company that produces and sells a travel guide that is updated monthly:
$\begin{array} { | l | r | } \hline \text { Fixed costs: } & \\\hline \text { Copy editing } & \$ 6,000 \\\hline \text { Art work } & \$ 2,000 \\\hline \text { Typesetting } & \$ 72,000 \\\hline\end{array}$
$\begin{array} { | l | l | } \hline \text { Variable costs: } & \\\hline \text { Printing and binding } & \$ 3.20 \text { per copy } \\\hline \text { Bookstore discounts } & \$ 4.00 \text { per copy } \\\hline \text { Salespersons' commissions } & \$ 0.50 \text { per copy } \\\hline \text { Author's royalties } & \$ 2.00 \text { per copy }\\\hline \end{array}$ Each book sells for $20.00. The company sold 8,000 books in June and 10,000 books in July.




-What is the contribution margin ratio for the book?

A) 71.5%.
B) 54.0%.
C) 51.5%.
D) 51.9%.