Contribution margin for each copy of the book

Question

Problem: Fixed expenses for each new edition of the book

Copy editing    $3,000.00
Art work          $1,000.00
Typesetting    $36,000.00

Variable expenses per copy of the book

Printing and binding             $1.60
Bookstore discounts            $2.00
Salespersons commission    $0.25
Author Royalities                $1.00

Each book sells for $10 per copy

Question 1: What would be the contribution margin for each copy of the book ?

Question 2: The contribution margin ratio for the textbook is?