Percent (Review)

• Part of a hundred.
• 247/823 or 30%
• Formula : A is what percent of B
• A = p B
• Example : Problem 50, page 413
  A = the number of inmates (612,000) p = the percentage full (90%) B = total capacity. x 612,000 = .9 x x = 612,000/.9 x = 680,000
• Example: Problem 52 page 413

  
  A = Amount raised    (225,000)
  P = percentage raised of goal x
  B = Total Goal  (500,000)
  
  225000 = x 500000
  
  x = 225000/500000
  
  x = 45%
      

• Example: 60, page 413
  A = discount amount x p = discount percentage 40% B = original price 16.50 x = .4 × 16.5 x = 6.6 The price then is 16.50 - 6.60 = 9.90
• Percentage decrease and percentage increase
  • percentage change = amount of change/ original amount
• Example: 62, page 414

  Original amount 67,100
  Ending Amount   87,400
  
  Amount of Change = 87,400 - 67,100 =  20,300
  
  Percentage Increase = 20,300/67,100 = 30%
      

• Example: 66, page 414

  Original price 380
  Sales Price    266
  
  Amount of change  380 - 266 = 114
  Percentage Decrease = 114/380 = 30%
      

Homework (Part 1)