PSLE Linda spent $330 in February. This amount was a 45% decrease from what she spent in January. The amount she spent in March was a 40% increase 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 |
- 45% |
|
February |
55% |
100 u |
Change |
|
+ 40 u |
March |
|
140 u |
(a)
Spending in January = 100%
Spending in February = 100% - 45% = 55%
55% = 330
1% = 330 ÷ 55 = 6
Spending in January
= 100%
= 100 x 6
= $600
Spending in February = 100 u
Spending in March = 100 u + 40 u = 140 u
100 u = 330
1 u = 330 ÷ 100 = 3.3
Spending in March
= 140 u
= 140 x 3.3
= $462
Total spending from January to March
= 600 + 330 + 462
= $1392
(b)
Decrease in spending in March compared to January
= 600 - 462
= $138
Percentage decrease
=
Decrease in spendingSpending in January x 100%
=
138600 x 100%
= 23%
Answer(s): (a) $1392; (b) 23%