PSLE Linda saved $1040 in August. This amount was a 30% increase from what she saved in July. The amount she saved in September was a 40% decrease from what she saved in August.
- What was the total amount that Linda saved from July to September?
- What was the percentage decrease in the amount Linda saved in September compared to July?
|
Savings |
July |
100% |
|
Change |
+ 30% |
|
August |
130% |
100 u |
Change |
|
- 40 u |
September |
|
60 u |
(a)
Savings in July = 100%
Savings in August = 100% + 30% = 130%
130% = 1040
1% = 1040 ÷ 130 = 8
Savings in July
= 100%
= 100 x 8
= $800
Savings in August = 100 u
Savings in September = 100 u - 40 u = 60 u
100 u = 1040
1 u = 1040 ÷ 100 = 10.4
Savings in September
= 60 u
= 60 x 10.4
= $624
Total savings from July to September
= 800 + 1040 + 624
= $2464
(b)
Decrease in savings in September compared to July
= 800 - 624
= $176
Percentage decrease
=
Decrease in savingsSavings in July x 100%
=
176800 x 100%
= 22%
Answer(s): (a) $2464; (b) 22%