Given the economic information as follows Consumption (C) = 400 + 0.8Yd Investment (I) = 400 - 150r Government expenditure (G) = 300 Tax = 150 Real money supply (Ms) = 4000 Transaction money demand (Md t) = 0.5Y Speculative money demand ((Ms d)/P) = 1000-500r Price (P) = 2 Unit: RM million a) Derive the IS curve and the LM curve in terms of Y and r.