PSLE Linda spent $480 in February. This amount was a 40% decrease from what she spent in January. The amount she spent in March was a 35% 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 |
- 40% |
|
February |
60% |
100 u |
Change |
|
+ 35 u |
March |
|
135 u |
(a)
Spending in January = 100%
Spending in February = 100% - 40% = 60%
60% = 480
1% = 480 ÷ 60 = 8
Spending in January
= 100%
= 100 x 8
= $800
Spending in February = 100 u
Spending in March = 100 u + 35 u = 135 u
100 u = 480
1 u = 480 ÷ 100 = 4.8
Spending in March
= 135 u
= 135 x 4.8
= $648
Total spending from January to March
= 800 + 480 + 648
= $1928
(b)
Decrease in spending in March compared to January
= 800 - 648
= $152
Percentage decrease
=
Decrease in spendingSpending in January x 100%
=
152800 x 100%
= 19%
Answer(s): (a) $1928; (b) 19%