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1) The population of Amber increased by 23% between 2011 and 2013. If there were 125,140 people in 2011, what was the new population in 2013?
=
2) A golf club is made up of 80 members and each member pays a subscription fee of £53. After a year, the members increased by 10% and the subscription fee reduced by 2%. How much did the club have at the end of the year?
=£
3) Most speedometers in cars have an error of about 5% from the true reading. Mrs. Smith’s speedometer indicates that she is driving at 70 km/h;
a) What is the lowest speed she could be driving at?
b) What is the highest speed she could be driving at?
a)= km/h
b)= km/h
4) Zozoba Trades and Industry increased the salary of its workers by 12.5%. Find the new salaries of workers who previously received:
a) $25,000 b) $52,000
a)=$
b)=
5) An increase of 20% in the price of a car raised its price to $160,200. What would have been the price if it had been reduced by 5% instead?
=$
6) The population of a city increases by 12% each year. In 2015, the population was about 5300.
a) What was their population in 2014? b) What will be their population in 2016?
a) =
b) =
7) Prove that a 10% decrease followed by 10% increase is equivalent to a 1% decrease overall.
=
8) A shop advertised a garden ornament at 10% off the sale price which was $50. The shop followed up with a second advertisement with another 10% off the new price. Show that this is not the same as 20% decrease in the original price.
= New price now $40.5 but 20% off = $
9) A computer system was priced at $1000 at the start of 2010. By 2011, it was 10% cheaper. If the price of the computer system reduces by 10% at the beginning of every year, what was the price of the computer system at the start of 2012?
=$
10) A pack of biscuit which costs $1.40 normally contains 300g of biscuit. There are two special offers:
Offer A: 20% more for the same price.
Offer B: same amount for 20% off the normal price.
Which is the better offer?