PSLE Linda spent $440 in October. This amount was a 10% increase from what she spent in September. The amount she spent in November was a 40% decrease from what she spent in October.
- What was the total amount that Linda spent from September to November?
- What was the percentage decrease in the amount Linda spent in November compared to September?
|
Spending |
September |
100% |
|
Change |
+ 10% |
|
October |
110% |
100 u |
Change |
|
- 40 u |
November |
|
60 u |
(a)
Spending in September = 100%
Spending in October = 100% + 10% = 110%
110% = 440
1% = 440 ÷ 110 = 4
Spending in September
= 100%
= 100 x 4
= $400
Spending in October = 100 u
Spending in November = 100 u - 40 u = 60 u
100 u = 440
1 u = 440 ÷ 100 = 4.4
Spending in November
= 60 u
= 60 x 4.4
= $264
Total spending from September to November
= 400 + 440 + 264
= $1104
(b)
Decrease in spending in November compared to September
= 400 - 264
= $136
Percentage decrease
=
Decrease in spendingSpending in September x 100%
=
136400 x 100%
= 34%
Answer(s): (a) $1104; (b) 34%