Problem :
(a) Describe the law of demand and the factors affecting demand.
(b) llustrate and Explain how demand of a commodity will change if there is a tax on that product.
(c) Describe the term Price Elasticity of Demand, how it is calculated and give an example of price elasticity and inelasticity.
(d) Distinguish between a variable cost and firm's fixed cost and give an example of each.