PSLE Linda spent $400 in March. This amount was a 50% decrease from what she spent in February. The amount she spent in April was a 40% increase from what she spent in March.
- What was the total amount that Linda spent from February to April?
- What was the percentage decrease in the amount Linda spent in April compared to February?
|
Spending |
February |
100% |
|
Change |
- 50% |
|
March |
50% |
100 u |
Change |
|
+ 40 u |
April |
|
140 u |
(a)
Spending in February = 100%
Spending in March = 100% - 50% = 50%
50% = 400
1% = 400 ÷ 50 = 8
Spending in February
= 100%
= 100 x 8
= $800
Spending in March = 100 u
Spending in April = 100 u + 40 u = 140 u
100 u = 400
1 u = 400 ÷ 100 = 4
Spending in April
= 140 u
= 140 x 4
= $560
Total spending from February to April
= 800 + 400 + 560
= $1760
(b)
Decrease in spending in April compared to February
= 800 - 560
= $240
Percentage decrease
=
Decrease in spendingSpending in February x 100%
=
240800 x 100%
= 30%
Answer(s): (a) $1760; (b) 30%