PSLE Linda spent $1040 in July. This amount was a 30% increase from what she spent in June. The amount she spent in August was a 30% decrease from what she spent in July.
- What was the total amount that Linda spent from June to August?
- What was the percentage decrease in the amount Linda spent in August compared to June?
|
Spending |
June |
100% |
|
Change |
+ 30% |
|
July |
130% |
100 u |
Change |
|
- 30 u |
August |
|
70 u |
(a)
Spending in June = 100%
Spending in July = 100% + 30% = 130%
130% = 1040
1% = 1040 ÷ 130 = 8
Spending in June
= 100%
= 100 x 8
= $800
Spending in July = 100 u
Spending in August = 100 u - 30 u = 70 u
100 u = 1040
1 u = 1040 ÷ 100 = 10.4
Spending in August
= 70 u
= 70 x 10.4
= $728
Total spending from June to August
= 800 + 1040 + 728
= $2568
(b)
Decrease in spending in August compared to June
= 800 - 728
= $72
Percentage decrease
=
Decrease in spendingSpending in June x 100%
=
72800 x 100%
= 9%
Answer(s): (a) $2568; (b) 9%