PSLE Linda spent $600 in October. This amount was a 20% increase from what she spent in September. The amount she spent in November was a 5% decrease 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 |
120% |
100 u |
Change |
|
- 5 u |
November |
|
95 u |
(a)
Spending in September = 100%
Spending in October = 100% + 20% = 120%
120% = 600
1% = 600 ÷ 120 = 5
Spending in September
= 100%
= 100 x 5
= $500
Spending in October = 100 u
Spending in November = 100 u - 5 u = 95 u
100 u = 600
1 u = 600 ÷ 100 = 6
Spending in November
= 95 u
= 95 x 6
= $570
Total spending from September to November
= 500 + 600 + 570
= $1670
(b)
Increase in spending in November compared to September
= 570 - 500
= $70
Percentage increase
=
Increase in spendingSpending in September x 100%
=
70500 x 100%
= 14%
Answer(s): (a) $1670; (b) 14%