Answer:Cross elasticity of demand = -1.25
Explanation:
Cross elasticity of demand= Per entage change in quantity of commodity A (plates)/ Percentage change in price of commodity B(cups)
Percentage change in quantity demanded for plates = (New quantity - old quantity/ old quantity ) x 100
={ (4450-4950)/4950] ×100
=-500/4950
= - 0.10×100= - 10%
Percentage change in price of cups =(New price - old price/ old price) x 100 [(4.05-3.75)/3.75]×100
=0.3/ 3.75
= 0.08×100= 8%
Cross price elasticity of demand = - 10%/8%
= - 1.25
Here, the cross elasticity of demand for these goods of cups and plates is negative(-1.25) showing that they are complementary goods since as the price for cups increases, the demand for plates decreased.