【題目】 You are an economist for the Taipei City Subway Commission. Presently, the price of a subway ride is $80, and 250,000 seats are filled weekly. The income elasticity of demand is -0.60. If a recession lowered area incomes by 5%, how many additional seats per week would the subway need? 1,000 seats 7,500 seats 1,500 seats 5,000 seats