PSLE Linda spent $560 in July. This amount was a 40% increase from what she spent in June. The amount she spent in August was a 50% 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 |
+ 40% |
|
July |
140% |
100 u |
Change |
|
- 50 u |
August |
|
50 u |
(a)
Spending in June = 100%
Spending in July = 100% + 40% = 140%
140% = 560
1% = 560 ÷ 140 = 4
Spending in June
= 100%
= 100 x 4
= $400
Spending in July = 100 u
Spending in August = 100 u - 50 u = 50 u
100 u = 560
1 u = 560 ÷ 100 = 5.6
Spending in August
= 50 u
= 50 x 5.6
= $280
Total spending from June to August
= 400 + 560 + 280
= $1240
(b)
Decrease in spending in August compared to June
= 400 - 280
= $120
Percentage decrease
=
Decrease in spendingSpending in June x 100%
=
120400 x 100%
= 30%
Answer(s): (a) $1240; (b) 30%