Practice Problems


1.  In 2000 there were 1,053,000 African-Americans in the city of Chicago, out of a total population of 2,896,000.  What % of Chicago’s population was African-American? 36%


2.  11% of US land devoted to State Parks and Recreation Areas is in the state of New York. The total amount of US land set aside for State Parks and Recreation Areas is 13,571,000 acres. How many acres of New York are designated as State Parks and Recreation Areas? 1,492,810 acres


3.  There are 533,200 people between the ages of 25 and 35 in the city of Chicago which is 18.41% of the city’s population.  What is the population of the city? 2,896,252 people


4.  In 1992 the population of the US was about 257 million.  In 2002, it was about 289 million.  By what percent did the population increase? 12.5%


5.  The following table list the 1998 average daily circulation of ten newspapers with the largest daily circulation in the US.


1998 Circulation

Wall Street Journal


USA Today


Los Angeles Times


New York Times


Washington Post

759, 122

New York Daily News

723, 143

Chicago Tribune


Newsday (Long Island, NY)


Houston Chronicle


Chicago Sun-Times


a. How many times as large was the circulation of the Wall Street Journal compared to the circulation of the Chicago Tribune? 2.58 times as large
b. The circulation of the Chicago Sun-Times  is what percent smaller than the circulation of the Chicago Tribune? 27.89% smaller
c. The newspaper that had the larger circulation in the world was Yomiuri Shimbun in Japan.  Its 1998 circulation was 14,532,694.  Its circulation is what percent larger than the circulation of the Wall Street Journal? 735% larger


6.  Consider the following data on carbon dioxide emissions.


1999 Carbon Dioxide  Emissions (millions of metric tons of carbon)







World Total


a. The US emissions are what percent greater than the emissions of China? 127.2%
b. The emissions of India are what percent less than the emissions of the US? 84.0%
c. What percent of the world total do US emissions represent? 24.7%

7.  Sales tax is 9.75%.  You buy an item for $37.00.  What is the final price of the article? $40.61


8.  In 1997 DePaul’s freshman enrollment was 1234 students.  Over the next four years, the freshman class grew by 66%.  What was the Fall 2001 freshman enrollment? 2,048 students


9.  In 1999, the number of crimes in Chicago was 231,265.  Between 1999 and 2000 the number of crimes decreases 5%.  How many crimes were committed in 2000? 219,702 crimes


10.  Google’s stock rose by 121.2% from January 2005 to January 2006, then dropped by 12.5% from January 2006 to August 2006. What is the percent change in stock from January 2005 to August 2006? 93.55% increase


11.  According to the official 2000 census, the Hispanic population of the US in 2000 was 35,306,000.  The population had risen an astounding 57.9% from 1990 to 2000.  What was the Hispanic population in 1990? 22,359,721 people


12.  During a 25% off sale, you buy an item for $22.50.  What was the original price of the item? $30