Calculating Percentage Change Flashcards
How do you find percentage change?
% change = ( new amount - old amount) divide old amount x 100
In a storm 144 fruit trees were left standing out of 180 fruit trees in an orchard.
What is the percentage decrease in the number of trees?
20%
A javelin thrower has best throw of 60m. In the next competition he throws 72m.
What is the percentage increase of his personal best?
20%
A wine manufacturer puts down 250 bottles for 3 years. After 3 years only 220 bottles are intact. What is the percentage decrease in the number of bottles?
10.8%
A board 130 cm long is trimmed to 104 cm. What percentage has been removed?
20%
A piece of elastic 48 cm long is stretched to 60 cm. What percentage of the original length is the increase?
25%
There are now 29 girls in a class that originally had 25 girls in it. What is the percentage increase in the number of girls in the class?
16%
After an accident, there are 222 litres of water left in a tank which originally held
240 litres. What is the percentage loss of water?
7.5%
Last year there were 500 children in a school. This year there are 565. What is the percentage increase in the number of pupils?
13%
A man’s weekly wage was £ 336, but now he earns £ 420. What is the percentage increase in the man’s wage?
25%
**Bill’s weight decreases from 64.8 kg to 59.3 kg.
Calculate the percentage decrease in Bill’s weight.
Give your answer correct to 3 significant figures.**
(64.8 - 59.3) divide 64.8 x 100 = 8.487
8.487 -> 8.49%
**George wants to watch all 23 games that a football team will play at home next season.
He can buy
a season ticket costing £425
or 23 separate tickets costing £24 each ticket.
What percentage of the total cost of 23 separate tickets does George save by buying a season ticket?**
£23 x 24 = £552
(552 - 425) divide 552 x 100 = 23%
