Basic Percentage Concepts
What is 50% of 200?
100
A price goes from 100 kr to 120 kr.
What is the percentage increase?
20%
6 kg of apples cost 48 kr.
How much do 9 kg cost?
8 kr per kg → 72 kr
A restaurant raises the price of a meal from $12 to $14. What is the percentage increase?
16.67%
A jacket costs $80 and is on sale for 20% off. How much is the discount?
$16
If a price is reduced by 25%, what fraction of the original price remains?
75%
If the price of a book increases from $12 to $15, what is the percentage increase?
25%
A product was originally priced at $200 and is now $160. What is the percentage decrease?
20% decrease
A jacket is originally priced at $60, but is now 30% off. What is the sale price?
$42
A car travels at 70 km/h.
How long to travel 210 km?
3h
What is the decimal form of 15%?
0.15
A population increases from 1,000 to 1,200. What is the percentage increase?
20% increase.
A recipe for 4 people needs 200 g rice.
How much rice for 10 people?
50 g per person → 500 g
The population of a city increased from 50,000 to 55,000. What is the percentage increase?
10% increase
A bank offers a 3% interest rate. If you invest $1,000, how much will you earn in one year?
$30
What is the formula to calculate a percentage of a number?
Multiply the number by the percentage (as a decimal). Percentage=Number×Decimal Form of Percentage
A student’s score increases from 75 to 90. What is the percentage increase?
20% increase.
A company’s revenue decreases from $500,000 to $450,000. What is the percentage decrease?
10% decrease
A student’s score on a test increased from 80 to 95. What is the percentage increase in the score?
18.75% increase
A phone’s price increases by 10%. If the original price was $500, what is the new price?
$550
A store reduces a $100 item by 30%. What is the percentage of the new price in relation to the original price?
70% of the original price
A shirt originally costs $50. It is now 20% more expensive. What is the new price?
$60 (50 * 1.20 = 60)
The population of a town decreases from 8,000 to 6,800. What is the percentage decrease?
15% decrease
8 workers build a wall in 6 days.
How many days for the same work if speed is the same but only 4 workers?
12 days
A bus travels 180 km in 3 hours.
How far in 5 hours at the same speed?
300km