Refer to Figure 3-7 below Donuts per week 10 15 Cups of coffee per week Figure 3-7 Suppose the price of coffee is $0.60 per cup. (For each blank box, use 2 decimal places without any sign (e.g. no $ or -/+), i.e. 8.00 or 0.78) a. What is the consumer's income? 9.00 A b. What is the price of a donut? 0.40 c. What is the slope of the indifference curve at point B? 4.5 A d. What is the consumer's marginal rate of substitution at point B? 0.00 A