year 8 maths

619
16
Raw material $110 (includes the 10% GST)
GST on sale = $10
GST credit = $0
Net GST to pay = $10
Production stage $440 (includes the 10% GST)
GST on sale = $40
GST credit = $10
Net GST to pay = $30
Distribution stage $572 (includes the 10% GST)
GST on sale = $52
GST credit = $40
Net GST to pay = $12
Retail stage $943.80 (includes the 10% GST)
GST on sale = $85.80
GST credit = $52
Net GST to pay = $33.80
GST paid by the final consumer = $85.80
8 1100 litres
9 600 kg
10 $300
11 a $50 b $150 c $600 d $30
e $10 f $2000
12 200
13 $40
14 D
15 800
y
16 D C × F or FD C
17 a no b No, it went to $118.80
c 9.0 . 9 . %
Puzzles and challenges
d 8 years
Exercise 4J
1 a $7 b $28 c $3.45 d $436
2 a $13 b $45 c $25.90 d $247
3 D
4 A
5 a 80% profit b 30% profit
c 25% loss
e 66 2 3 % profit
g 33 1 3 % loss
d 16% loss
f 37.5% profit
h 22% loss
6 a 20% increase b 16 2 3 % decrease
c 500% increase
d 150% increase
7 a 25% increase b 20% increase
c 140% increase
8 20% loss
9 650% profit
10 a $36 b 75% profit
11 a $350 b 87.5% profit
12 a $2200 b 44% loss
13 Example: Value = $200, because the 10% decrease is of a
larger amount.
14 store A
15 a i 100% ii 66 2 % iii 80%
3
b Term 2
16 a 396 070
c 500% growth
b i 22 803 196 ii 24 056 866 iii 26 301 344
c 2.0%
Exercise 4K
1 B 2 D 3 B 4 $500
5 a $900 b $800 c $1100 d $500
e $550 f $250
6 $90
7 a $120 b $240 c $15 d $21
1 72.8%
2 96%
1
3
1000
4 $ 48
5 53%
5
6
12
7 30%
8 49 years
9 6:33 a.m.
10 a b = − 5 6 , c = −1 3
b b = 1 19
30 , c = 111
12
Multiple-choice questions
1 B 2 E 3 D 4 C
5 D 6 B 7 B 8 E
9 C 10 B 11 E
Short-answer questions
1 a 21 b 8 c 10
b 3 c 17
2
2 a 5 9
7
11
3 a
b 1 8
d 1 7
e 5 13
12
20
4 a 8 b 13
28
1
d 6
e
18
7
3
5 a
b
15
20
d 19
20
c 1 3 4
f 3 17
30
c 14
f 2
c
9
25
e −5 f 7 7
12
Cambridge Maths NSW
Stage 4 Year 8 Second edition
ISBN 978-1-108-46627-1 © Palmer et al. 2018
Cambridge University Press
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