PSLE Linda spent $750 in February. This amount was a 25% 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 |
+ 25% |
|
February |
125% |
100 u |
Change |
|
- 40 u |
March |
|
60 u |
(a)
Spending in January = 100%
Spending in February = 100% + 25% = 125%
125% = 750
1% = 750 ÷ 125 = 6
Spending in January
= 100%
= 100 x 6
= $600
Spending in February = 100 u
Spending in March = 100 u - 40 u = 60 u
100 u = 750
1 u = 750 ÷ 100 = 7.5
Spending in March
= 60 u
= 60 x 7.5
= $450
Total spending from January to March
= 600 + 750 + 450
= $1800
(b)
Decrease in spending in March compared to January
= 600 - 450
= $150
Percentage decrease
=
Decrease in spendingSpending in January x 100%
=
150600 x 100%
= 25%
Answer(s): (a) $1800; (b) 25%