PSLE Linda spent $240 in July. This amount was a 20% 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 |
+ 20% |
|
July |
120% |
100 u |
Change |
|
- 50 u |
August |
|
50 u |
(a)
Spending in June = 100%
Spending in July = 100% + 20% = 120%
120% = 240
1% = 240 ÷ 120 = 2
Spending in June
= 100%
= 100 x 2
= $200
Spending in July = 100 u
Spending in August = 100 u - 50 u = 50 u
100 u = 240
1 u = 240 ÷ 100 = 2.4
Spending in August
= 50 u
= 50 x 2.4
= $120
Total spending from June to August
= 200 + 240 + 120
= $560
(b)
Decrease in spending in August compared to June
= 200 - 120
= $80
Percentage decrease
=
Decrease in spendingSpending in June x 100%
=
80200 x 100%
= 40%
Answer(s): (a) $560; (b) 40%