What is the arch elasticity of demand, given the following quantity and price combinations? Q1 = 1.25 visits/month, Q2 = 1.5 visits/month; while P1 = $20 per visit P2 = $10.00 per visit Where the Q is the number of outpatient visits, and P represents the price per visit. In other words, the quantity demanded has changed from Q1 to Q2, in response to a price change from P1 to P2. What is the arch elasticity of demand, given the following quantity and price combinations? Q1 = 1.25 visits/month, Q2 = 1.5 visits/month; while P1 = $20 per visit P2 = $10.00 per visit Where the Q is the number of outpatient visits, and P represents the price per visit. In other words, the quantity demanded has changed from Q1 to Q2, in response to a price change from P1 to P2. 0.273 -0.333 -0.273 0.333