PSLE Linda spent $260 in February. This amount was a 30% increase from what she spent in January. The amount she spent in March was a 40% decrease from what she spent in February.
- What was the total amount that Linda spent from January to March?
- What was the percentage decrease in the amount Linda spent in March compared to January?
|
Spending |
January |
100% |
|
Change |
+ 30% |
|
February |
130% |
100 u |
Change |
|
- 40 u |
March |
|
60 u |
(a)
Spending in January = 100%
Spending in February = 100% + 30% = 130%
130% = 260
1% = 260 ÷ 130 = 2
Spending in January
= 100%
= 100 x 2
= $200
Spending in February = 100 u
Spending in March = 100 u - 40 u = 60 u
100 u = 260
1 u = 260 ÷ 100 = 2.6
Spending in March
= 60 u
= 60 x 2.6
= $156
Total spending from January to March
= 200 + 260 + 156
= $616
(b)
Decrease in spending in March compared to January
= 200 - 156
= $44
Percentage decrease
=
Decrease in spendingSpending in January x 100%
=
44200 x 100%
= 22%
Answer(s): (a) $616; (b) 22%