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TSA 2014 · Question 49 · Ratio/Proportion/Percentage

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The West Water Canoe School offers tuition in basic canoeing skills. There are 18 canoes for students to use. The school offers a minimum instructor to student ratio of 1:6 and a minimum of two instructors for any group. Instructors are hired by the centre on a casual basis and are paid only for the time they actually work. Instructors are paid £6 per hour and are expected to use their own canoes. The cost for students depends on the numbers in the group and the length of the session. Costs are set out in the table below.

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What is the maximum profit the centre can make from a group after paying the instructors for a two-hour session?