PSLE Linda spent $1170 in July. This amount was a 30% increase from what she spent in June. The amount she spent in August was a 20% decrease 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 |
+ 30% |
|
July |
130% |
100 u |
Change |
|
- 20 u |
August |
|
80 u |
(a)
Spending in June = 100%
Spending in July = 100% + 30% = 130%
130% = 1170
1% = 1170 ÷ 130 = 9
Spending in June
= 100%
= 100 x 9
= $900
Spending in July = 100 u
Spending in August = 100 u - 20 u = 80 u
100 u = 1170
1 u = 1170 ÷ 100 = 11.7
Spending in August
= 80 u
= 80 x 11.7
= $936
Total spending from June to August
= 900 + 1170 + 936
= $3006
(b)
Increase in spending in August compared to June
= 936 - 900
= $36
Percentage increase
=
Increase in spendingSpending in June x 100%
=
36900 x 100%
= 4%
Answer(s): (a) $3006; (b) 4%