In year Y imported machine tools accounted for 70 percent of total machine-tools sales in the United States, and Japanese imports accounted for 50 percent of the sales of imported machine tools. If the total sales of machine tools imported from Japan that year was x billion dollars, then the total sales of all machine tools in the United States was how many billion dollars?	Select the correct option:
A) 3.86x B) 4.86x C) 5.86x D) 2.86x E) 6.86x
Sales of imported tools = 70% of the total sales = 0.70*{total} = 7{total}/10;   Sales of Japanese tools = 50% of the sales of imported tools = 5/10*7{total}/10 = 35{total}/100   Since the sales of of Japanese tools was x, then 35{total}/100 = x --&gt;35 {total} = 100x   {total} = 100/35 *x = 2.86 x   Answer: 2.86x
<result>D</result>
In year Y imported machine tools accounted for 70 percent of total machine-tools sales in the United States, and Japanese imports accounted for 50 percent of the sales of imported machine tools. If the total sales of machine tools imported from Japan that year was x billion dollars, then the total sales of all machine tools in the United States was how many billion dollars?