PSLE Linda spent $240 in August. This amount was a 40% decrease from what she spent in July. The amount she spent in September was a 25% increase from what she spent in August.
- What was the total amount that Linda spent from July to September?
- What was the percentage decrease in the amount Linda spent in September compared to July?
|
Spending |
July |
100% |
|
Change |
- 40% |
|
August |
60% |
100 u |
Change |
|
+ 25 u |
September |
|
125 u |
(a)
Spending in July = 100%
Spending in August = 100% - 40% = 60%
60% = 240
1% = 240 ÷ 60 = 4
Spending in July
= 100%
= 100 x 4
= $400
Spending in August = 100 u
Spending in September = 100 u + 25 u = 125 u
100 u = 240
1 u = 240 ÷ 100 = 2.4
Spending in September
= 125 u
= 125 x 2.4
= $300
Total spending from July to September
= 400 + 240 + 300
= $940
(b)
Decrease in spending in September compared to July
= 400 - 300
= $100
Percentage decrease
=
Decrease in spendingSpending in July x 100%
=
100400 x 100%
= 25%
Answer(s): (a) $940; (b) 25%