I am not understanding this pie chart

art below shows the percentage of total revenue that a publisher receives from various types of publications, Use this chart to answer the question (a) Which category accounts for approximately one-eighth of the publisher's total revenue? Select One v Textbooks (b) Approximately what percentage of the total revenue comes from Textbooks and Cookbooks combined? Write your answer as a multiple of 10%% - that is, 10%, 20%, Cookbooks 30% ... Nonfiction Poetry (c) If the revenue from Magazines is 249% of the total Paperbacks revenue, approximately what percentage of the total revenue Magazines 4 comes from Nonfiction? 72% X