Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall. 7.4 Applications of Percent

Martin-Gay, Prealgebra, 6ed 22 Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall. The freshman class of 450 students is 36% of all students at State College. How many students go to State College? State the problem in words, then translate to an equation. Equation Method In words: In words: 450 is 36% of what number? Solve: Solve: 450  0.36x Translate:450  36%x Equation Method

Martin-Gay, Prealgebra, 6ed 33 Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall. The freshman class of 450 students is 36% of all students at State College. How many students go to State College? the problem in words, then translate to a proportion. State the problem in words, then translate to a proportion. Proportion Equation Method In words: 450 is 36% of what number? Translate and Solve: amountbasepercent Proportion Method

Martin-Gay, Prealgebra, 6ed 44 Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall. Percent Increase Percent Decrease percent increase percent increase  percent decrease percent decrease  In each case write the quotient as a percent. Helpful Hint Make sure that this number in the denominator is the original number and not the new number.