PSLE Linda saved $1080 in August. This amount was a 20% increase from what she saved in July. The amount she saved in September was a 25% 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 |
+ 20% |
|
August |
120% |
100 u |
Change |
|
- 25 u |
September |
|
75 u |
(a)
Savings in July = 100%
Savings in August = 100% + 20% = 120%
120% = 1080
1% = 1080 ÷ 120 = 9
Savings in July
= 100%
= 100 x 9
= $900
Savings in August = 100 u
Savings in September = 100 u - 25 u = 75 u
100 u = 1080
1 u = 1080 ÷ 100 = 10.8
Savings in September
= 75 u
= 75 x 10.8
= $810
Total savings from July to September
= 900 + 1080 + 810
= $2790
(b)
Decrease in savings in September compared to July
= 900 - 810
= $90
Percentage decrease
=
Decrease in savingsSavings in July x 100%
=
90900 x 100%
= 10%
Answer(s): (a) $2790; (b) 10%