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Power point percentages

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• 1. PercentageApplications
• 2. What does percentage mean?
In mathematics, a percentage is a way of expressing a number as a fraction of 100 (per cent meaning "per hundred". It is often denoted using the percent sign, "%". For example, 45%) read as "forty five percent" is equal to 45 / 100, or 0.45.
• 3. Why are percentages necessary?
It allows us to better visualize how much of a whole is being represented also is important for other things such as finance and interest rates.
Shops advertise discounts on products.  These discounts are percentages."Up to 50% off marked prices“
Financial institutions quote interest charged to the client on loans, or interest paid for money invested, as a percentage.
"Housing Loans-4.95% p.a. for the first 12 months"Interest paid may be as Simple Interest or Compound Interest.
Companies describe their success or failure as an increase or decrease in profit levels."C-Company profit down by 15% for the last financial year“
A salesperson may be given a commission as payment for selling goods.  The commission can be a percentage of the sales made.
"Position Vacant:  20% commission on all sales to the successful applicant.“
Articles such as antiques or jewelery may increase in value as time goes by-appreciation.
Items such as equipment and machinery usually decrease in value-depreciation
• 4. When do we add a percentage?
Weadd a percentagewhentheprice of anitem at a shop has tax.
Anotherexample of addedpercentagesiswhen at a restaurant a certainamountispaid as a tip.
A thirdsituationwouldbewhenanamount has increasedover a period of time: forexample , theprice of anitem, theminimumwageorthepopulation of a country fromoneyeartoanother.
• 5. When do we subtract a percentage?
Thefirstsituationwouldbewhenanitem in a shop has a discount.
Anotherinstancecouldbewhenwewanttoknowthe original price of anitemwhich has a taxonit.
• 6. How do wefindthepercentof anamount?
Exercise: findthe 17% of \$65
Steps:
Changethepercentto decimal : 17% = 0.17
Multiplytheamountbythe decimal : 65x0.17
Theproductisthe 17% of 65.
65x0.17 = 11.05