Suppose the total U.S. market size for smartphones by January 2021 is 280,000,000 units and the total sales revenue is $210,000 million. Apple has sold 95,000,000 units of iPhones, while Samsung has sold 100,800,000 units. In average, iPhone's unit price is $900, while Samsung has an average unit price of $800. Given this information, answer the following questions: What are the unit market shares of Apple and Samsung? What are the revenue market shares of Apple and Samsung? What do these market share numbers tell you about Apple and Samsung in the smartphone market?