Carol owns a fast food restaurant named The Restaurant. She recently took a course in managerial economics and is eager to apply her knowledge to the management of her business. She decides to estimate the price elasticity (EP) and income elasticity (EI) of demand for DoodleBurgers and the cross-price elasticity (EDF) of demand for "her product" with respect to the price of "other product", her chief competitor. In order to estimate these elasticities, she collects the information that is listed in the table below, where Q is the quantity of "her product" sold in a week, PD is the price of a "her product" during the week, I is per capita annual income, and PF is the price of a "other product" during the week.

Q 1,000 1,100 983 831 PD $1.20 $1.20 $1.20 $1.40 I $10,000 $10,000 $11,000 $10,000 $1.00 $1.10 $1.00 $1.00