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Disposable Income (Y)_ Consumption (C) $ 0 $ 30 40 60 80 90 120 120 160 150 Use the above data to answer the questions below: a. Write the linear equation representing the economy's consumption schedule. Clearly show your steps and calculations. b. With your equation in (a) above, calculate the economy's consumption at $135 level of disposable income. Clearly show your steps and calculations. c. Estimate the economy's saving at $135 level of disposable income. Clearly show your steps and calculations. d. Determine the economy's marginal propensity to save. Clearly show your steps and calculations