percentage

The expression percent, is everywhere. The percentage is very useful in several arias, the financial market is used to express inflationary and deflationary indices, discounts, increases, interest rates, among others. In Engineering, the percentage can be used to define how much has already been constructed in a building; Administration can be used to measure the participation shares of the partners in a business.

Some examples:

- In 2006, Luis Inacio Lula da Silva was the preference of 61% of the vote.

- The unemployment rate in Brazil grew 13% this year.

- 25% discount on cash purchases.

- Gasoline increased by 15%

   The term percent (%) to the ratios of the resulting 100 is called proximate reason.

Percentage	Percent ratio	Decimal number
1%	1/100	0,01
5%	5/100	0,05
8%	8/100	0,08
11%	11/100	0,11
15%	15/100	0,15
10,5%	10,5/100	0,105
20%	20/100	0,20

Example 1:

   Maria threw out 20% of the 100 magazines she had. How many magazines were to waste?

100 x 20/100 (twenty percent) = 20 magazines

Therefore, two magazines were thrown off by Maria.

example 2

I bought 20 shirts to resell. The first exit I was

lucky and managed to sell 70%. How many pieces of clothing I sold?

70% of 20 is 14 We arrived at this value by the account below:

20. = 0.7 14

   Therefore: I sold 14 of 20 shirts

    Multiplication factor

Multiplication factor is an increase or a decrease in the value of

product.

     If a product has increased by 20% then its multiplication factor is 1 +

growth rate, such rate being 0.2. So your factor

multiplication is 1.2.

Below is a table of multiplication factors:

Increase or profit

Multiplication factor

Increase or profit	Multiplication factor
12%	0,88
17%	0,83
45%	0,55
48%	0,52
50%	0,50

example:

    Selling a shirt that cost 50.00 with a real increase of

10% are:

50 * 1.1 = 55.00 reais

   If a product has a discount of 20% then its multiplication factor

is 1 - decrease rate, such rate being 0.2. So your factor

multiplication is 0.8.

Below is a table of multiplication factors:

Discount	Mulplication factor
12%	0,88
17%	0,83
45%	0,55
48%	0,52
50%	0,50

example:

Discounting 20% amounting to 50.00 reais, we have:

50 * 0,80 = 40,00 reais