PSLE Linda saved $595 in August. This amount was a 15% decrease from what she saved in July. The amount she saved in September was a 40% 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 |
- 15% |
|
August |
85% |
100 u |
Change |
|
+ 40 u |
September |
|
140 u |
(a)
Savings in July = 100%
Savings in August = 100% - 15% = 85%
85% = 595
1% = 595 ÷ 85 = 7
Savings in July
= 100%
= 100 x 7
= $700
Savings in August = 100 u
Savings in September = 100 u + 40 u = 140 u
100 u = 595
1 u = 595 ÷ 100 = 5.95
Savings in September
= 140 u
= 140 x 5.95
= $833
Total savings from July to September
= 700 + 595 + 833
= $2128
(b)
Increase in savings in September compared to July
= 833 - 700
= $133
Percentage increase
=
Increase in savingsSavings in July x 100%
=
133700 x 100%
= 19%
Answer(s): (a) $2128; (b) 19%