PSLE Linda saved $700 in August. This amount was a 40% increase from what she saved in July. The amount she saved in September was a 45% 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 |
+ 40% |
|
August |
140% |
100 u |
Change |
|
- 45 u |
September |
|
55 u |
(a)
Savings in July = 100%
Savings in August = 100% + 40% = 140%
140% = 700
1% = 700 ÷ 140 = 5
Savings in July
= 100%
= 100 x 5
= $500
Savings in August = 100 u
Savings in September = 100 u - 45 u = 55 u
100 u = 700
1 u = 700 ÷ 100 = 7
Savings in September
= 55 u
= 55 x 7
= $385
Total savings from July to September
= 500 + 700 + 385
= $1585
(b)
Decrease in savings in September compared to July
= 500 - 385
= $115
Percentage decrease
=
Decrease in savingsSavings in July x 100%
=
115500 x 100%
= 23%
Answer(s): (a) $1585; (b) 23%