% / 100 = is / of
(new-old) / old x 100
New = og (1 +/- decimal percent)
I = PxRxT
Rounding
100

What percent of 80 is 60

75%

100

New: 40

Old: 50

-20%

100

There were 5500 people in Cary in 1985. Twenty years later, in 2005, there was a 140 % increase in the population. What is the new population?

13200 people

100

P=$20,000

R=8%

T=15 years


I=

$24,000

100

22.23

22.2

200

55% of what number is 550

1000

200

New: $289

Old: $200

44.5%

200

A stereo went on sale for 25% off. It was originally $250. How much will the stereo cost after the discount?

187.5

200

P=$1250

R=6.5%

T=4 years


I=

$325

200

14.856934

14.9


300

What number is 24% of 700

168


300

Old: 56

New: 98

75%

300

There were 3000 cars in an automobile show. Then 32% more cars showed up. How many cars were there when the show ended?

3960 cars


300

P=$280000

R=3.25%

T=40


I=

$364000

300

14698.2869

14698.3


400

18% of what number is 45

250

400

2014: 329

2000: 125

163.2%

400

Originally, the price of an I-Pod was $199.99. Then the price decreased by 40%. What is the new price of the I-Pod?

$119.94

400

P=$1520

R= 6.35%

T=6


I=

$579.12

400

1.987

2.0

500

42% of 840 cans is how many cans

352.8


500

Now: 500 people

Then: 980people


-49.0%

500
A CD used to cost $4.99 in 1995. The price has gone up 185%. What is the new cost of a CD?

$14.22

500

P=$15,000

R=13.25%

T=11


I=

$21862.50

500

148.888

148.9


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