PSLE Linda saved $285 in August. This amount was a 5% 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 |
- 5% |
|
August |
95% |
100 u |
Change |
|
+ 40 u |
September |
|
140 u |
(a)
Savings in July = 100%
Savings in August = 100% - 5% = 95%
95% = 285
1% = 285 ÷ 95 = 3
Savings in July
= 100%
= 100 x 3
= $300
Savings in August = 100 u
Savings in September = 100 u + 40 u = 140 u
100 u = 285
1 u = 285 ÷ 100 = 2.85
Savings in September
= 140 u
= 140 x 2.85
= $399
Total savings from July to September
= 300 + 285 + 399
= $984
(b)
Increase in savings in September compared to July
= 399 - 300
= $99
Percentage increase
=
Increase in savingsSavings in July x 100%
=
99300 x 100%
= 33%
Answer(s): (a) $984; (b) 33%