Use the following data to answer the next question. The disposable income (DI) and consumption (C) schedules are for a private, closed economy. All figures are in billions of dollars. Disposable Income: $0 $80 $160 $240 $320 $400 Consumption $8 $80 $152 $224 $296 $368 If consumption increases by $10 billion at each level of disposable income, the marginal propensity to consume will