PSLE Linda saved $650 in August. This amount was a 35% decrease from what she saved in July. The amount she saved in September was a 20% increase 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 |
- 35% |
|
August |
65% |
100 u |
Change |
|
+ 20 u |
September |
|
120 u |
(a)
Savings in July = 100%
Savings in August = 100% - 35% = 65%
65% = 650
1% = 650 ÷ 65 = 10
Savings in July
= 100%
= 100 x 10
= $1000
Savings in August = 100 u
Savings in September = 100 u + 20 u = 120 u
100 u = 650
1 u = 650 ÷ 100 = 6.5
Savings in September
= 120 u
= 120 x 6.5
= $780
Total savings from July to September
= 1000 + 650 + 780
= $2430
(b)
Decrease in savings in September compared to July
= 1000 - 780
= $220
Percentage decrease
=
Decrease in savingsSavings in July x 100%
=
2201000 x 100%
= 22%
Answer(s): (a) $2430; (b) 22%