Math 106 2.3, 2.4

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Author:
Latoyaw78
ID:
35338
Filename:
Math 106 2.3, 2.4
Updated:
2010-09-17 12:22:50
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math
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Description:
Solving Percent problems, Applications
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  1. What percent of 300 is 45?
    • P * 330= 45 ***divid 300 in to 45
    • P= 300/45
    • P= .15
    • P= 15%
  2. 38 is what percent of 304
    • 38/304= P ***divid 304 in to 38
    • .125 = P
    • 125% = P
  3. 12 is 15% of what number?
    • 12 = 0.15 *N *** divid .15 into 12
    • 12/0.15 = N
    • 80=N
  4. What number is 6% of 12?
    • N= 0.06*12
    • N= 0.72
    • Therefore, 0.72 is 6% of 12
  5. 23 1/3% of 900 is what number?
    23 1/3% = 70/30 * 1/100= 7/30

    • Answer:
    • 7/30 *900= N
    • 210= N
  6. 69% of $21 is what number?
    • .69* $21 = N
    • $14.49= N
  7. rate of change = the change (divided by) original amount
  8. A doctor's basic office fee was increased from $6 to $7.50. Find the percent increase.
    Rate of change = the change of rate (divided by) original amount. In this case the change represents an increase ($1.50); hence ,
  9. rate of increase = increase (divided by) original fee
    • rate of increase = $1.50/$6
    • rtae of increase = 0.25 or 25%
  10. Eyeglass frams priced at $18.20 are to be remarked to $14.56 because the style change.
    • original price = $18.20
    • the change = $3.64
    • Determine the rate of decrease...
    • 20%: $3.64/$18.20 = 0.2
  11. Steve saved $576 from his annual income of $6,000. What percent of his income did he save?
    • 1. Determin what the the problem is asking you to find
    • a. The savings ($576) is what percent of his annual income ($6,400)
    • 2. State the problem
    • b. $576 is what percent of $6,400
    • 3. Estimate the answer
    • c. observe what 10% of the annual income would be $640 saved; hence the answer would be slightly less than 10%
    • 4. Solve and check Problem
    • d.
    • P= $576/ $6,400
    • P= 0.09
    • p= 9%
    • check: 9% * $6400 = $576

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