9. A researcher estimated that the price elasticity of demand for automobiles in the United States is −1.2, while the income elasticity of demand is 3.0. Next year, U.S. automakers intend to increase the average price of automobiles by 5 percent, and they expect consumers’ disposable income to rise by 3 percent. (a) If sales of domestically produced automobiles are 8 million this year, how many automobiles do you expect U.S. automakers to sell next year? (b) By how much should domestic auto-makers increase the price of automobiles if they wish to increase sales by 5 percent next year?