PSLE Linda spent $270 in September. This amount was a 10% 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 |
- 10% |
|
September |
90% |
100 u |
Change |
|
+ 40 u |
October |
|
140 u |
(a)
Spending in August = 100%
Spending in September = 100% - 10% = 90%
90% = 270
1% = 270 ÷ 90 = 3
Spending in August
= 100%
= 100 x 3
= $300
Spending in September = 100 u
Spending in October = 100 u + 40 u = 140 u
100 u = 270
1 u = 270 ÷ 100 = 2.7
Spending in October
= 140 u
= 140 x 2.7
= $378
Total spending from August to October
= 300 + 270 + 378
= $948
(b)
Increase in spending in October compared to August
= 378 - 300
= $78
Percentage increase
=
Increase in spendingSpending in August x 100%
=
78300 x 100%
= 26%
Answer(s): (a) $948; (b) 26%