PSLE Linda spent $1300 in October. This amount was a 30% increase from what she spent in September. The amount she spent in November was a 10% 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 |
+ 30% |
|
October |
130% |
100 u |
Change |
|
- 10 u |
November |
|
90 u |
(a)
Spending in September = 100%
Spending in October = 100% + 30% = 130%
130% = 1300
1% = 1300 ÷ 130 = 10
Spending in September
= 100%
= 100 x 10
= $1000
Spending in October = 100 u
Spending in November = 100 u - 10 u = 90 u
100 u = 1300
1 u = 1300 ÷ 100 = 13
Spending in November
= 90 u
= 90 x 13
= $1170
Total spending from September to November
= 1000 + 1300 + 1170
= $3470
(b)
Increase in spending in November compared to September
= 1170 - 1000
= $170
Percentage increase
=
Increase in spendingSpending in September x 100%
=
1701000 x 100%
= 17%
Answer(s): (a) $3470; (b) 17%