PSLE Linda spent $420 in March. This amount was a 5% increase from what she spent in February. The amount she spent in April was a 40% decrease 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 |
+ 5% |
|
March |
105% |
100 u |
Change |
|
- 40 u |
April |
|
60 u |
(a)
Spending in February = 100%
Spending in March = 100% + 5% = 105%
105% = 420
1% = 420 ÷ 105 = 4
Spending in February
= 100%
= 100 x 4
= $400
Spending in March = 100 u
Spending in April = 100 u - 40 u = 60 u
100 u = 420
1 u = 420 ÷ 100 = 4.2
Spending in April
= 60 u
= 60 x 4.2
= $252
Total spending from February to April
= 400 + 420 + 252
= $1072
(b)
Decrease in spending in April compared to February
= 400 - 252
= $148
Percentage decrease
=
Decrease in spendingSpending in February x 100%
=
148400 x 100%
= 37%
Answer(s): (a) $1072; (b) 37%