PSLE Linda spent $285 in October. This amount was a 5% decrease from what she spent in September. The amount she spent in November was a 40% 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 |
- 5% |
|
October |
95% |
100 u |
Change |
|
+ 40 u |
November |
|
140 u |
(a)
Spending in September = 100%
Spending in October = 100% - 5% = 95%
95% = 285
1% = 285 ÷ 95 = 3
Spending in September
= 100%
= 100 x 3
= $300
Spending in October = 100 u
Spending in November = 100 u + 40 u = 140 u
100 u = 285
1 u = 285 ÷ 100 = 2.85
Spending in November
= 140 u
= 140 x 2.85
= $399
Total spending from September to November
= 300 + 285 + 399
= $984
(b)
Increase in spending in November compared to September
= 399 - 300
= $99
Percentage increase
=
Increase in spendingSpending in September x 100%
=
99300 x 100%
= 33%
Answer(s): (a) $984; (b) 33%