PSLE Linda saved $180 in July. This amount was a 40% decrease from what she saved in June. The amount she saved in August was a 20% increase from what she saved in July.
- What was the total amount that Linda saved from June to August?
- What was the percentage decrease in the amount Linda saved in August compared to June?
|
Savings |
June |
100% |
|
Change |
- 40% |
|
July |
60% |
100 u |
Change |
|
+ 20 u |
August |
|
120 u |
(a)
Savings in June = 100%
Savings in July = 100% - 40% = 60%
60% = 180
1% = 180 ÷ 60 = 3
Savings in June
= 100%
= 100 x 3
= $300
Savings in July = 100 u
Savings in August = 100 u + 20 u = 120 u
100 u = 180
1 u = 180 ÷ 100 = 1.8
Savings in August
= 120 u
= 120 x 1.8
= $216
Total savings from June to August
= 300 + 180 + 216
= $696
(b)
Decrease in savings in August compared to June
= 300 - 216
= $84
Percentage decrease
=
Decrease in savingsSavings in June x 100%
=
84300 x 100%
= 28%
Answer(s): (a) $696; (b) 28%