Units Of Measurement And Applications Worksheet Page 36
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44WORKED EXAMPLE 3
A car dealer sells a car for $19 240. This represents the cost of the car to him plus a profi t of 30%. For what
price did the dealer buy the car?
Solve
Think
Apply
130% of the cost price = $19 240
Cost price of car
Find 1% of the cost price of
= ($19 240 ÷ 130) × 100
1% of the cost price = $19 240 ÷ 130
the car and then multiply by
= $14 800
= $148
100 to fi nd (100% of) the cost
∴ 100% of the cost price = $14 800
price.
8
A car dealer sells a car for $15 000. This represents a profi t of 25% on his cost. Complete the following to fi nd
the cost of the car to the dealer.
____% of the cost price = $15 000
1% of the cost price = $15 000 ÷ ____ = $____
∴ 100% of the cost price = $____ × ____ = $____
9
Sarah’s salary increase was 2.5%. If her weekly salary is now $697, what was her salary before the increase?
10
Ian has a 60% no-claim bonus on his car insurance.
a
If he receives a 60% discount on the full cost of the insurance, what percentage of the full cost does he pay?
b
If he pays $512, what is the full cost of the insurance?
11
Where were you when the burglar came?
This sector graph shows the results of an analysis of burglary
Shopping
claims made to an insurance company. In this particular year
1125 people were on holidays when their home was burgled.
On holidays
7%
At work
a
How many were shopping?
9%
b
31%
How many were at work?
Other
11%
c
How many were on the premises?
d
How many claims were analysed by the insurance
11%
Visiting
company?
31%
On the premises
12
The recipe shown for stir-fried pork
Stir-fried Pork
serves 4 people.
a
How much of each ingredient
600 g pork
would be needed to make this
3 tbsp peanut oil
recipe for:
8 spring onions
1 _
i
ii
6 people?
9 people?
2
tsp grated ginger
2
b
Penny has 1.5 kg of pork. How
2 tbsp lime juice
many people can she feed using
1 _
cup chicken stock
3
this recipe, assuming she has
200 g sliced beans
enough of all the other ingredients?
SPREADSHEET APPLICATION 2.1
70
Insight Mathematics General 11
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