PSLE Linda saved $720 in July. This amount was a 20% decrease from what she saved in June. The amount she saved in August was a 10% 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 |
- 20% |
|
July |
80% |
100 u |
Change |
|
+ 10 u |
August |
|
110 u |
(a)
Savings in June = 100%
Savings in July = 100% - 20% = 80%
80% = 720
1% = 720 ÷ 80 = 9
Savings in June
= 100%
= 100 x 9
= $900
Savings in July = 100 u
Savings in August = 100 u + 10 u = 110 u
100 u = 720
1 u = 720 ÷ 100 = 7.2
Savings in August
= 110 u
= 110 x 7.2
= $792
Total savings from June to August
= 900 + 720 + 792
= $2412
(b)
Decrease in savings in August compared to June
= 900 - 792
= $108
Percentage decrease
=
Decrease in savingsSavings in June x 100%
=
108900 x 100%
= 12%
Answer(s): (a) $2412; (b) 12%