PSLE Linda saved $540 in August. This amount was a 35% increase from what she saved in July. The amount she saved in September was a 20% decrease 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 |
+ 35% |
|
August |
135% |
100 u |
Change |
|
- 20 u |
September |
|
80 u |
(a)
Savings in July = 100%
Savings in August = 100% + 35% = 135%
135% = 540
1% = 540 ÷ 135 = 4
Savings in July
= 100%
= 100 x 4
= $400
Savings in August = 100 u
Savings in September = 100 u - 20 u = 80 u
100 u = 540
1 u = 540 ÷ 100 = 5.4
Savings in September
= 80 u
= 80 x 5.4
= $432
Total savings from July to September
= 400 + 540 + 432
= $1372
(b)
Increase in savings in September compared to July
= 432 - 400
= $32
Percentage increase
=
Increase in savingsSavings in July x 100%
=
32400 x 100%
= 8%
Answer(s): (a) $1372; (b) 8%