PSLE Linda spent $950 in August. This amount was a 5% decrease from what she spent in July. The amount she spent in September was a 40% increase from what she spent in August.
- What was the total amount that Linda spent from July to September?
- What was the percentage increase in the amount Linda spent in September compared to July?
|
Spending |
July |
100% |
|
Change |
- 5% |
|
August |
95% |
100 u |
Change |
|
+ 40 u |
September |
|
140 u |
(a)
Spending in July = 100%
Spending in August = 100% - 5% = 95%
95% = 950
1% = 950 ÷ 95 = 10
Spending in July
= 100%
= 100 x 10
= $1000
Spending in August = 100 u
Spending in September = 100 u + 40 u = 140 u
100 u = 950
1 u = 950 ÷ 100 = 9.5
Spending in September
= 140 u
= 140 x 9.5
= $1330
Total spending from July to September
= 1000 + 950 + 1330
= $3280
(b)
Increase in spending in September compared to July
= 1330 - 1000
= $330
Percentage increase
=
Increase in spendingSpending in July x 100%
=
3301000 x 100%
= 33%
Answer(s): (a) $3280; (b) 33%