10. A clothing retailer reduces the price of shirts from $50 to f40. As a result, quantity demanded rises from 20,000 to 24,000 per month. What is the best estimate for price elasticity of demand? A. - 1. B. -2.5. C. +2.5. D. -2. 11. The increase in the London Congestion Charge from $5 to f8 has resulted in a fall in the number of car journeys and an increase in the demand for bus journeys. This suggests that, with respect to the price of car journeys, the cross elasticity of demand for bus journeys is A. negative. B. price elastic. C. price inelastic. D. positive