PSLE Linda spent $1300 in March. This amount was a 30% increase from what she spent in February. The amount she spent in April was a 30% 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 |
+ 30% |
|
March |
130% |
100 u |
Change |
|
- 30 u |
April |
|
70 u |
(a)
Spending in February = 100%
Spending in March = 100% + 30% = 130%
130% = 1300
1% = 1300 ÷ 130 = 10
Spending in February
= 100%
= 100 x 10
= $1000
Spending in March = 100 u
Spending in April = 100 u - 30 u = 70 u
100 u = 1300
1 u = 1300 ÷ 100 = 13
Spending in April
= 70 u
= 70 x 13
= $910
Total spending from February to April
= 1000 + 1300 + 910
= $3210
(b)
Decrease in spending in April compared to February
= 1000 - 910
= $90
Percentage decrease
=
Decrease in spendingSpending in February x 100%
=
901000 x 100%
= 9%
Answer(s): (a) $3210; (b) 9%