PSLE Linda saved $1015 in August. This amount was a 45% 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 |
+ 45% |
|
August |
145% |
100 u |
Change |
|
- 40 u |
September |
|
60 u |
(a)
Savings in July = 100%
Savings in August = 100% + 45% = 145%
145% = 1015
1% = 1015 ÷ 145 = 7
Savings in July
= 100%
= 100 x 7
= $700
Savings in August = 100 u
Savings in September = 100 u - 40 u = 60 u
100 u = 1015
1 u = 1015 ÷ 100 = 10.15
Savings in September
= 60 u
= 60 x 10.15
= $609
Total savings from July to September
= 700 + 1015 + 609
= $2324
(b)
Decrease in savings in September compared to July
= 700 - 609
= $91
Percentage decrease
=
Decrease in savingsSavings in July x 100%
=
91700 x 100%
= 13%
Answer(s): (a) $2324; (b) 13%