Based on the information in the table below, what is the marginal propensity to consume when income level rises from 3,000 to 4,000? Income Consumption expenditure 1,000 600 2,000 1,400 3,000 2,200 4,000 3,000 ( 1) 0.6 ( 2) 0.8 ( 3) 0.73 ( 4) 0.75