PSLE Linda spent $360 in July. This amount was a 10% decrease from what she spent in June. The amount she spent in August was a 20% 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 |
|
+ 20 u |
August |
|
120 u |
(a)
Spending in June = 100%
Spending in July = 100% - 10% = 90%
90% = 360
1% = 360 ÷ 90 = 4
Spending in June
= 100%
= 100 x 4
= $400
Spending in July = 100 u
Spending in August = 100 u + 20 u = 120 u
100 u = 360
1 u = 360 ÷ 100 = 3.6
Spending in August
= 120 u
= 120 x 3.6
= $432
Total spending from June to August
= 400 + 360 + 432
= $1192
(b)
Increase in spending in August compared to June
= 432 - 400
= $32
Percentage increase
=
Increase in spendingSpending in June x 100%
=
32400 x 100%
= 8%
Answer(s): (a) $1192; (b) 8%