PSLE Linda spent $1450 in July. This amount was a 45% 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 |
+ 45% |
|
July |
145% |
100 u |
Change |
|
- 20 u |
August |
|
80 u |
(a)
Spending in June = 100%
Spending in July = 100% + 45% = 145%
145% = 1450
1% = 1450 ÷ 145 = 10
Spending in June
= 100%
= 100 x 10
= $1000
Spending in July = 100 u
Spending in August = 100 u - 20 u = 80 u
100 u = 1450
1 u = 1450 ÷ 100 = 14.5
Spending in August
= 80 u
= 80 x 14.5
= $1160
Total spending from June to August
= 1000 + 1450 + 1160
= $3610
(b)
Increase in spending in August compared to June
= 1160 - 1000
= $160
Percentage increase
=
Increase in spendingSpending in June x 100%
=
1601000 x 100%
= 16%
Answer(s): (a) $3610; (b) 16%