I've derived foreign export supply function and home import demand function in world market, but I'm stuck at solving the others. Can I get some detailed step-by-step explanations? Demand and supply in Foreign and Home market are characterized by the following functions, D* = 30 - P*, S* = 2P*, D = 120 - P, and S = P where D, D*, S, and S* represent Home and Foreign demand and supply functions for a product called X, respectively, with P and P* denoting the local price of product X in Home and Foreign market, respectively. Calculate the free trade price of product X, together with the number of product X traded between Foreign and Home market at that free trade price. Free trade price = - # of product X traded Derivation: Now, Home government considers imposing a specific tariff of t (per unit) on imports. Derive the price of X in the world market and the amount of imports as functions of t. The price of X in the world market = The amount of X imports = Derivation: