PSLE Linda spent $720 in July. This amount was a 10% decrease from what she spent in June. The amount she spent in August was a 40% increase from what she spent in July.
- What was the total amount that Linda spent from June to August?
- What was the percentage increase in the amount Linda spent in August compared to June?
|
Spending |
June |
100% |
|
Change |
- 10% |
|
July |
90% |
100 u |
Change |
|
+ 40 u |
August |
|
140 u |
(a)
Spending in June = 100%
Spending in July = 100% - 10% = 90%
90% = 720
1% = 720 ÷ 90 = 8
Spending in June
= 100%
= 100 x 8
= $800
Spending in July = 100 u
Spending in August = 100 u + 40 u = 140 u
100 u = 720
1 u = 720 ÷ 100 = 7.2
Spending in August
= 140 u
= 140 x 7.2
= $1008
Total spending from June to August
= 800 + 720 + 1008
= $2528
(b)
Increase in spending in August compared to June
= 1008 - 800
= $208
Percentage increase
=
Increase in spendingSpending in June x 100%
=
208800 x 100%
= 26%
Answer(s): (a) $2528; (b) 26%