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1. (a) Suppose a doughnut costs 66 and a biscuit costs 4 and Joan has 624 to spend. Draw Joans budget constraint with biscuits on the vertical(Y) axis. Suppose that Joans preferences are such that she is always indifferent between an extra 2 biscuits and an extra 1 doughnut. (b) (i) What is Joans Marginal Rate of substitution? Explain (ii) Draw Joans indifference map and find the bundle that will maximize Joans utility. Illustrate this on a diagram. (c) Suppose the price of doughnuts rises to 9. Would Joan change her optimal bundle? Illustrate this on a diagram.

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