could you please help me solve this question? I do not even understand how to derive the demand functions here

C3. Suppose that country A imports good X from country B and the corresponding demand curve is Q); = ll/(P, where a > 0 and Pf is a per unit price in $ (country A's currency). Country B imports good Y from country A and the corresponding demand function is Q}: = 120/ (P33. where B > 0 and PE is a per unit price in (country's B currency). Suppose that any amount of good X can be purchased in country B at price of 64 per unit. Similarly, any amount of good Y could be purchased in country A at price $16 per unit. Denote by E the nominal exchange rate dened as the price of $1 in terms of . (a| [10 marks] Derive the demand function for $ (country A's currency). Identify the parameters conditions that result in downward sloping demand curve. 0!) i. [10 marks] Derive the supply function of 83 (country A's currency). Identify the parameters conditions that result in upward sloping supply curve. ii. [5 marks] Explain the result intuitively (HINT: think of demand elasticity). (c) [10 marks] Suppose a = 1.5, ,6 = 0.5. Find the equilibrium exchange rate. Illustrate the equilibrium in the market for dollars graphically. (d) i. [5 marks] If the price of good Y falls, do you expect depreciation or appreciation of domestic currency (HINT: do not calculate exchange rate at this stage, think of demand elasticity)? ii. [10 marks] Suppose the price of good Y goes down by $7, how is the equilibrium exchange rate affected? Illustrate the effect of this shock graphically. (e) [10 marks] Suppose that exchange rate is xed at the level found in (c). What should the Central Bank of country A do after the fall in price of good Y to keep the exchange rate constant? Illustrate the effect of this policy graphically