PSLE Linda spent $240 in November. This amount was a 40% decrease from what she spent in October. The amount she spent in December was a 45% increase from what she spent in November.
- What was the total amount that Linda spent from October to December?
- What was the percentage decrease in the amount Linda spent in December compared to October?
|
Spending |
October |
100% |
|
Change |
- 40% |
|
November |
60% |
100 u |
Change |
|
+ 45 u |
December |
|
145 u |
(a)
Spending in October = 100%
Spending in November = 100% - 40% = 60%
60% = 240
1% = 240 ÷ 60 = 4
Spending in October
= 100%
= 100 x 4
= $400
Spending in November = 100 u
Spending in December = 100 u + 45 u = 145 u
100 u = 240
1 u = 240 ÷ 100 = 2.4
Spending in December
= 145 u
= 145 x 2.4
= $348
Total spending from October to December
= 400 + 240 + 348
= $988
(b)
Decrease in spending in December compared to October
= 400 - 348
= $52
Percentage decrease
=
Decrease in spendingSpending in October x 100%
=
52400 x 100%
= 13%
Answer(s): (a) $988; (b) 13%