PSLE Linda saved $120 in August. This amount was a 40% decrease from what she saved in July. The amount she saved in September was a 45% 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 |
- 40% |
|
August |
60% |
100 u |
Change |
|
+ 45 u |
September |
|
145 u |
(a)
Savings in July = 100%
Savings in August = 100% - 40% = 60%
60% = 120
1% = 120 ÷ 60 = 2
Savings in July
= 100%
= 100 x 2
= $200
Savings in August = 100 u
Savings in September = 100 u + 45 u = 145 u
100 u = 120
1 u = 120 ÷ 100 = 1.2
Savings in September
= 145 u
= 145 x 1.2
= $174
Total savings from July to September
= 200 + 120 + 174
= $494
(b)
Decrease in savings in September compared to July
= 200 - 174
= $26
Percentage decrease
=
Decrease in savingsSavings in July x 100%
=
26200 x 100%
= 13%
Answer(s): (a) $494; (b) 13%