The Marginal Propensity to Consume (MPC) is the additional amount consumed as a fraction of additional disposable income.Initial income = N150.New income = N250.Change in income = N250 – N150 = 100Initial consumption = N100New consumption = N150.Change in consumption = N150 - N100 = N50.MPC = Change in consumption ÷ Change in income .= 50/100 = ½MPC = 0.5