In the following macroeconomic model, the unknowns are Y (national income), C (consumption) and 7 (tax collection): Y=C la Go C = 2 0.8(Y - T) T = 1 0.2y lo (investment) and Go (government expenditure) are assumed to be known. i) Rewrite this model in matrix algebraic format. (8 points ii) Find Y, C and 7 in terms of lo and Go (6 points iii) What happens to Y, C and T when Go increases by x units