Elsa Corporation, a company that manufactures and markets low-end table computers, asked our friend Ms. Market Researcher to create the demand curve for its SD 721 model. She conducted some market research and gave Elsa the demand curve as well as some additional information: 350,000 units of SD 721 will sell at a price of $250. (1) What is the point price elasticity if 500,000 units will sell at a price of $200