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(c) When demand is perfectly inelastic. (d) When demand is elastic 1.5 Calculate the arc elasticity of demand for a bag of cement between two points on the demand curve when at point 1 the price is R75 and quantity demanded is 500, and at point 2 the price is R60 and quantity demanded is 800. (a) 0, 1 (b) 0,2 (c) 0,5 (d) 0,8 G What floor tiles ricas by 140% the quantity of ceramic floor tiles a