recap;
4 out of 20 as a %
4/20 x 100/1
100 = 5
20 = 1
4/20 x 100/1 = 20%
20% of 400
20/100 x 400/1 = 80%
both zeros in 100 and 400 are cut out
increasing or decreasing by a percentage
eg; find the new value when
a) $120 is increased by 50%
50% of 120 = $60
new value; 120 + 60 = $180
50% = - half
120 - 50% = 60.
60 x 2 = 120
or
150/100 x 120/1 = $180
b) $20 is decreased by 50%
50% 120 = $60
new value = 120 - 60 = $60
c) $110 is increased by 15%
15/100 x 100/1 = $126.50
new value = 110 + 16.5 = 126.50
or
115/100 x 110/1 = $126.50
1 zero is cut out from 100 and 110
110
100% original amount
16.5
15%
d) $110 is reduced by 15%
15/100 x 110 = 16.50
new value: 110 - 16.50 = 93.50
or
100% - 15% = 85%
85/100 x 110/1 = $93.50
me actually doing work for once woah omg lol:
$120 is increased by 20%
120 x 1.2 = 144
$180 is increased by 80%
180 x 1.8 = 324
$50 is decreased by 10
50 divided by 10 = 5
50 - 5 = 45
= 45
$78 is decreased by 20%
100% - 20% = 80%
80/100 x 78/1 = 62.4
$400 is increased by 10%
$240 is increased by 15%
115/100 x 240/1 =
cross out 1 zero from 100 and 240 =
115/10 x 24/1 = 276
$80 is decreased by 20%
20% of 80 = 16
80 - 16 = 64
$42000 is decreased by 2%
2% of 42,000 = 840
42,000 - 840 = 41,160
$5000 is increased by 8%
5000 divided by 100 = 50
50 x 1 = 50
5 x 8 = 40
5400
$60.60 is increased by 60%
60% of 60.60 = 36.36
60.60 + 36.36 = 96.96
$15 is decreased by 10%
10% of 15 = 1.5
15 - 1.5 = 13.5
$84 is decreased by 40%
40% of 84 = 33.6
84 - 33.6 = 50.4
YOU ARE READING
school work wow
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