Understanding percentages
'Percent' means out of...
100
I need to find 15% of 200. What do I type into the calculator?
15% x 200 =
Which mathematical operations (plus, minus, times, divide) are meant by 'increase' and 'decrease'?
Increase means +
Decrease means -
How does a business make a profit?
Charge their customers more than the cost of running the business
Adam earns $12.70 an hour. How much does he earn for 8 hours of work?
12.70 x 8 = $101.60
How do you convert a fraction or a decimal to a percentage?
Times it by 100
What is 50% of 8 kg ?
4 kg
If something is increased by 15%, what is the new percentage?
100% + 15% = 115%
Will earns a salary of $76 875. How much is this each month?
76 875 รท 12 = $6406.25
Write 12 out of 25 as a percentage.
48%
What is 5% of $200?
$10
If something is decreased by 15%, what is the new percentage?
100% - 15% = 85%
It costs a dealership $22 000 to build a car. The dealership marks up the price by 45%. How much will the car be sold for?
145% x 22 000 = $31 900
Caitlin earns $790 each week. How much does she earn each year?
790 x 52 = $41 080
What is 3 seconds out of 1 minute as a percentage?
5%
About 80% of the mass of the human body is water. If a person weighs 60 kg, how many kilograms of water make up their body weight?
80% x 60 = 48 kg
Plumbers on a salary of $82 000 are given a 3% pay increase. Find their new annual salary.
103% x 82 000 = $84 460
A car salesman receives a commission of 2% on the cars he sells. One month, he sold $84 000 worth of cars. Calculate his commission that month.
2% x 84000 = $1680
In a test out of 50 marks, Shyla lost 20 marks. What is her result as a percentage?
30/50 = 60%
In a class of 25 students, 20% have been overseas. How many students have NOT been overseas?
80% x 25 = 20 students
A laptop's original price is $2100. It is decreased by 15% in a sale. What is the sale price?
85% x 2100 = $1785
A manufacturer produces an item for $400 and sells it for $540. Determine the profit made and express this profit as a percentage of the cost price.
Profit = 540 - 400 = $140
Percentage profit = 140/400 x 100 = 35%
Meghan's hourly rate of pay is $16. Calculate her wage for a week when she works 10 hours at normal rate, 2 hours at time-and-a-half, and 1 hour at double time.
normal: 10 x 16 = $160
time-and-a-half: 2 x 16 x 1.5 = $48
double: 1 x 16 x 2 = $32
TOTAL: 160 + 48 + 32 = $240