Percent

1
Percent

• per

cent
hundred
2
Percentage Problems

• amount rate ? base
• rate is in decimal form
• of means times

3
Example

• What is 6.2 of 126?

rate0.062
times
base126
amountA
equals
7.812
7.8
A

0.062

126
4
Example

• What is the rings regular price?

Price marked is 20 off regular price
559
5
Common Error

• 20 of 559 is 0.2(559) 111.8
• Adding this to 559 gives
• 559 111.8 670.8

6
Correct Solution

• Let R be the regular price.
• 559 R - 0.2R
• 559 0.8R
• 559/0.8 R
• R 698.75

7
Example

• You earn a 5 commission on sales. How much do
  you have to sell to get a 2000 commission?

8
Solution

• 2000 is 5 of sales

rate0.05
times
base(sales)
amount2000
equals

2000

0.05
sales
sales

2000
/
0.05

40000