PSLE Linda saved $280 in August. This amount was a 40% increase from what she saved in July. The amount she saved in September was a 5% 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 |
+ 40% |
|
August |
140% |
100 u |
Change |
|
- 5 u |
September |
|
95 u |
(a)
Savings in July = 100%
Savings in August = 100% + 40% = 140%
140% = 280
1% = 280 ÷ 140 = 2
Savings in July
= 100%
= 100 x 2
= $200
Savings in August = 100 u
Savings in September = 100 u - 5 u = 95 u
100 u = 280
1 u = 280 ÷ 100 = 2.8
Savings in September
= 95 u
= 95 x 2.8
= $266
Total savings from July to September
= 200 + 280 + 266
= $746
(b)
Increase in savings in September compared to July
= 266 - 200
= $66
Percentage increase
=
Increase in savingsSavings in July x 100%
=
66200 x 100%
= 33%
Answer(s): (a) $746; (b) 33%