PSLE Linda spent $510 in March. This amount was a 15% 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 increase in the amount Linda spent in April compared to February?
|
Spending |
February |
100% |
|
Change |
- 15% |
|
March |
85% |
100 u |
Change |
|
+ 40 u |
April |
|
140 u |
(a)
Spending in February = 100%
Spending in March = 100% - 15% = 85%
85% = 510
1% = 510 ÷ 85 = 6
Spending in February
= 100%
= 100 x 6
= $600
Spending in March = 100 u
Spending in April = 100 u + 40 u = 140 u
100 u = 510
1 u = 510 ÷ 100 = 5.1
Spending in April
= 140 u
= 140 x 5.1
= $714
Total spending from February to April
= 600 + 510 + 714
= $1824
(b)
Increase in spending in April compared to February
= 714 - 600
= $114
Percentage increase
=
Increase in spendingSpending in February x 100%
=
114600 x 100%
= 19%
Answer(s): (a) $1824; (b) 19%