need help with this question

Suppose you are given the following information for an economy without government spending, exports, or imports. C is desired consumption, l is desired investment, and Y is income. C and l are given by: C = 500 + 0.8Y |=4OO a. What is the equation for the aggregate expenditure (AE) function? (Round your response for the intercept term to the nearest Whole number and for the slope term to one decimal place.) AE= + Y b. Applying the equilibrium condition, Y = AE, the equilibrium income that would set the actual national income to the desired aggregate expenditure can be calculated as $ c. The level of consumption and savings at the equilibrium level of income are $ and $ Finally, the level of investment expenditures at the equilibrium level of income is equal to , respectively. (Round your responses to the nearest dollar.) . (Round your response to the nearest dollar ) . (Round your response to the nearest dollar)