Answer:
The cross-price elasticity of demand between goods A and B is calculated as the percentage change in the quantity of good A demanded divided by the percentage change in the price of good B.
Using the given information, we have:
cross-price elasticity of demand = (% change in quantity of A demanded) / (% change in price of B)
We are given that the quantity of A demanded falls 10% when the price of B falls 5%. We can express these changes as:
% change in quantity of A demanded = -10%
% change in price of B = -5%
Plugging these values into the formula, we get:
cross-price elasticity of demand = (-10%) / (-5%) = 2
Therefore, the cross-price elasticity of demand between goods A and B is 2.0, which is option (a).