The following pie-chart shows the percentage distribution of the expenditure incurred in publishing a book. Study the pie-chart and the answer the question based on it.The price of the book is marked 20% above the C.P. If the marked price of the book is Rs. 180, then what is the cost of the paper used in a single copy of the book?

• A. Rs. 36
• B. Rs. 37.50
• C. Rs. 42
• D. Rs. 44.25