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PERCENT INCREASE OR DECREASE PROBLEMS To see the answer, pass your mouse over the colored area. 11. In Problems 1 and 2, first ask this question: ____ is what percent of ____ ? 11. "Out of" problem 11. a) 9 out of 50 students were absent. What percent were absent? 11. a) Ask the following question. 9 is what percent of 50 ? 11. a) Now answer that question. 18% 11.
b) 1000 people were surveyed, and 456 responded Yes. What 11. a) Ask the following question. 456 is what percent of 1000 ? 11. a) Now answer that question. 45.6% 11.
c) In a group of 200 people, 84 were of blood group A. What 11. a) Ask the following question. 84 is what percent of 200 ? 11. a) Now answer that question. 42% 11.
d) Anna earns $450 a week, and she pays $45 in taxes. What percent 11. a) Ask the following question. $45 is what percent of $450 ? 11. a) Now answer that question. 10% 12. Difference problem. In each of the following, there was a change First, ask this question: The difference is what percent of the original? 12. a) A sweater was marked down from $40 to $30. 12. a) This was a difference of what percent? 11. a) Ask the following question. $10 is what percent of $40 ? 11. a) Now answer that question. 25% 12. b) A sweater was marked up from $40 to $50. 12. b) This was a difference of what percent? 11. a) Ask the following question. $10 is what percent of $40 ? 11. a) Now answer that question. 25% 12. c) Last month's bill was $60, while this month's is $90. 12. a) This was a difference of what percent? 11. a) Ask the following question. $30 is what percent of $60? 11. a) Now answer that question. 50% 12. d) Last month's bill was $60, while this month's is $120. 12. a) This was a difference of what percent? 11. a) Ask the following question. $60 is what percent of $60 ? 11. a) Now answer that question. 100% 12. e) Marilyn's rent went from $500 to $440. 12. a) This was a difference of what percent? 11. a) Ask the following question. $60 is what percent of $500 ? 11. a) Now answer that question. 12% 12. f) Marilyn's rent went from $500 to $560. 12. a) This was a difference of what percent? 11. a) Ask the following question. $60 is what percent of $500 ? 11. a) Now answer that question. 12% 12. g) The price of a stock went from $32 to $36. 12. a) This was a difference of what percent? 11. a) Ask the following question. $4 is what percent of $32 ? 11. a) Now answer that question. 12½% 12. h) The price of a stock went from $32 to $28. 12. a) This was a difference of what percent? 11. a) Ask the following question. $4 is what percent of $32 ? 11. a) Now answer that question. 12½% 12. i) A population grew from 100,000 in 1980 to 116,000 in 1990. 12. a) This was a difference of what percent? 11. a) Ask the following question. 16,000 is what percent of 100,000 ? 11. a) Now answer that question. 16% 12. j) A population decreased from 240,000 in 1985 to 210,000 in 1995. 12. a) This was a difference of what percent? 11. a) Ask the following question. 30,000 is what percent of 240,000 ? 11. a) Now answer that question. 12½% Calculator Problems 13. (Is each one an "out of" problem or a "difference problem"?) 13. Celia's monthly rent is $487.52. She earns $1,845.34 a month. What 14. Henry's rent was reduced from $751.12 a month to $732.50. This 15. At Merrytime College, there are 9,312 students, and 2,195 are 16. A skirt that usually sells for $42.50 is on sale for $32.50. This is a 17. Alfred earns $502.27 per week, and his taxes are $84.12. What 18. Alfred earns $502.27 per week, but he takes home $418.15. What 19. Jane's bank account grew from $2,175 to $3,011. This was an 10. Jane had $2,175 in the bank, and she withdrew $478.25. What 11. A jacket that last year sold for $65, this year costs $72. This was an Continue on to the next section. or Return to the previous section. Please make a donation to keep TheMathPage online. Copyright © 2001-2007 Lawrence Spector Questions or comments? E-mail: themathpage@nyc.rr.com |