Nurul Sdn Bhd (NSB) is a small bookstore which has been selling comic books in Puchong for two years. The owner, Puan Nurul plans to achieve a minimum profit of RM2,500 in the month of December 2020. According to her, this amount reasonable since during the school holidays in December many students would buy her books to read. Fixed costs which comprise mainly rental and salary are RM 1,100 monthly. The cost of books are expected to increase by 10% from its previous cost of RM4.90 per book and currently the selling price of each book is RM7.50. Required: a) Calculate contribution margin per unit and contribution ratio. (5 Marks) b) Calculate the number of comic books that NSB needs to sell in order to achieve the break-even