PSLE Linda spent $760 in September. This amount was a 5% decrease from what she spent in August. The amount she spent in October was a 40% increase from what she spent in September.
- What was the total amount that Linda spent from August to October?
- What was the percentage increase in the amount Linda spent in October compared to August?
|
Spending |
August |
100% |
|
Change |
- 5% |
|
September |
95% |
100 u |
Change |
|
+ 40 u |
October |
|
140 u |
(a)
Spending in August = 100%
Spending in September = 100% - 5% = 95%
95% = 760
1% = 760 ÷ 95 = 8
Spending in August
= 100%
= 100 x 8
= $800
Spending in September = 100 u
Spending in October = 100 u + 40 u = 140 u
100 u = 760
1 u = 760 ÷ 100 = 7.6
Spending in October
= 140 u
= 140 x 7.6
= $1064
Total spending from August to October
= 800 + 760 + 1064
= $2624
(b)
Increase in spending in October compared to August
= 1064 - 800
= $264
Percentage increase
=
Increase in spendingSpending in August x 100%
=
264800 x 100%
= 33%
Answer(s): (a) $2624; (b) 33%