Complete the following exercises on a separate sheet of paper. You may use the textbook, your notes, the internet, and a calculator as resources. Your responses must include appropriate math and/or explanation. Show your work and justify your reasoning! Some exercises may require you to make assumptions or look up additional information. State any assumptions or sources in your response. Each problem is 2 points. 1. (3.8.5) In Q New Yorker on March 29, 2010 James mete that the 25 million iPhones Apple sold in 2009 represented 2.2 percent of world cell phone purchases. a. Use Wis numbers to estimate how many people bought a cell phone in 2009. b. Estimate the percentage of the world population that bought a cell phone in 2009. 2. (3.8.4) In a recent negotiation, the union negotiated a 1.5% raise for all staff. If a staff member's annual salary is $35,000, what is her salary after the raise takes effect? 3. (3.8.16) The January 2010 National Health Expenditures report stated that overall health care spending in the United States rose from $7,421 per person in 2007 to $7,681 per person in 2008. a. Calculate the absolute change in health care spending per person from 2007 to 2008. b. Calculate the percentage change in health care spending per person from 2007 to 2008. c. Estimate the total amount spent on health care in the United States in 2007 and in 2008. 4. (3.8.14) We regularly use 300 million as an estimate for the population of the United States. a. Find the absolute and relative changes when you use that figure instead of the correct one. b. Answer the previous question for the years 2000 and 2010. 5. (3.10.46). On December 17, 2010, the Wilmington, North Carolina Warned an Associated Press report headlined "13 million get unexpected tax bill from Obama tax credit". The report said that The Internal Revenue Service reported that the average tax refund was $2,892 in the 2010 filing season, up from $2,663 in 2009. However, the number of refunds dropped by 3.5 percent to 93.3 million. a. What was the percentage increase in the average tax refund from 2009 to 2010? b. How many refunds were there in 2009 and in 2010? (Use the information given in the problem to find your answer.) c. The number of refunds decreased while the average refund increased, so you need some arithmetic to decide how the totalI dollar amount refunded changed from 2009 to 2010. Find that change in both absolute and percentage terms