Percentages
T
est yourself
Percentage of a quantity
Work out
a) 24% of 76 =
b) 61% of 120 =
c) 7% of 3600 =
d) 99% of 99 =
One number as a percentage of another
Complete
a) 5 as a percentage of 25 is
%
b) 75 as a percentage of 500 is
%
c) 18 as a percentage of 20 is
%
d) 24 is
% of 96
Percentage increase
a) Increase 340 by 20%:
b) Increase 542 by 80% :
c) Increase 550 by 17.5% :
d) Increase 640 by 12.6% :
Percentage decrease
a) Decrease 250 by 20% :
b) Decrease 630 by 12% :
c) Decrease 560 by 83% :
d) Decrease 430 by 41%:
Find a chane as a percentage
Work out the percentage change and indicate if it is an increase (i) or a decrease (d)
a) From 23 to 26.45 :
%
b) From 150 to 120 :
%
c) From 68 to 127.84:
%
d) From 72 to 46.08 :
%
Finding the original amount
After an increase of 20%, an amount is 62.4. The original amount was
After an increase of 12%, an amount is 73.92. The original amount was
After a decrease of 30%, an amount is 39.2. The original amount was
After a decrease of 82%, an amount is 162. The original amount was
Successive percentage changes
Calculate the overall percentage change for each of these, stating whether it is an increase or a decrease.
a) a 30% increase then a 20% decrease:
%
b) a 12% decrease then a 35% increase:
%
c) a 32% decrease then a 32% increase:
%
d) a 14% decrease then a 20% decrease:
%
Compound interests
Calculate the final amount (to the nearest pence) when
a) £400 is invested at 3% p.a. for 8 years : £
b) £750 is invested at 8% p.a. for 9 years : £
c) £1500 is invested at 4.5% p.a. for 10 years : £
d) £300 is invested at 5.5% p.a. for 7 years: £
Check
OK