In a survey conducted at the Kumasi Technical Institute, the percentage of students studying various courses were found to be as follows: Leather works only, 18%, Leatherwork, 26%, Plumbing, 48%, Plumbing and Graphic Design but not Leatherwork, 5%, Leather work not Graphic Design, 23%, Leatherwork and Plumbing, 8%. 24% of the students studied none of these courses. Find the percentage studying the following using Venn Diagram
(a) Graphic Design only
(b) Plumbing only
(c) Leather work and Graphic Design
(d) All three courses
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