PSLE Linda spent $240 in October. This amount was a 20% decrease from what she spent in September. The amount she spent in November was a 45% increase from what she spent in October.
- What was the total amount that Linda spent from September to November?
- What was the percentage increase in the amount Linda spent in November compared to September?
|
Spending |
September |
100% |
|
Change |
- 20% |
|
October |
80% |
100 u |
Change |
|
+ 45 u |
November |
|
145 u |
(a)
Spending in September = 100%
Spending in October = 100% - 20% = 80%
80% = 240
1% = 240 ÷ 80 = 3
Spending in September
= 100%
= 100 x 3
= $300
Spending in October = 100 u
Spending in November = 100 u + 45 u = 145 u
100 u = 240
1 u = 240 ÷ 100 = 2.4
Spending in November
= 145 u
= 145 x 2.4
= $348
Total spending from September to November
= 300 + 240 + 348
= $888
(b)
Increase in spending in November compared to September
= 348 - 300
= $48
Percentage increase
=
Increase in spendingSpending in September x 100%
=
48300 x 100%
= 16%
Answer(s): (a) $888; (b) 16%