Basic Micro題：葵芳Euro GoGo價錢係隔籬A-1 Restaurant嘅一半，顧客估計係十倍。問葵芳食客對西餐的需求彈性為？
Basic Microeconomics question: restaurant E’s price is half of restaurant A’s and it had ten times the customers. Calculate the price elasticity of demand of diners in this region.