PSLE Linda saved $480 in August. This amount was a 20% decrease from what she saved in July. The amount she saved in September was a 45% increase from what she saved in August.
- What was the total amount that Linda saved from July to September?
- What was the percentage increase in the amount Linda saved in September compared to July?
|
Savings |
July |
100% |
|
Change |
- 20% |
|
August |
80% |
100 u |
Change |
|
+ 45 u |
September |
|
145 u |
(a)
Savings in July = 100%
Savings in August = 100% - 20% = 80%
80% = 480
1% = 480 ÷ 80 = 6
Savings in July
= 100%
= 100 x 6
= $600
Savings in August = 100 u
Savings in September = 100 u + 45 u = 145 u
100 u = 480
1 u = 480 ÷ 100 = 4.8
Savings in September
= 145 u
= 145 x 4.8
= $696
Total savings from July to September
= 600 + 480 + 696
= $1776
(b)
Increase in savings in September compared to July
= 696 - 600
= $96
Percentage increase
=
Increase in savingsSavings in July x 100%
=
96600 x 100%
= 16%
Answer(s): (a) $1776; (b) 16%