PSLE Linda spent $1260 in August. This amount was a 40% increase from what she spent in July. The amount she spent in September was a 10% decrease from what she spent in August.
- What was the total amount that Linda spent from July to September?
- What was the percentage increase in the amount Linda spent in September compared to July?
|
Spending |
July |
100% |
|
Change |
+ 40% |
|
August |
140% |
100 u |
Change |
|
- 10 u |
September |
|
90 u |
(a)
Spending in July = 100%
Spending in August = 100% + 40% = 140%
140% = 1260
1% = 1260 ÷ 140 = 9
Spending in July
= 100%
= 100 x 9
= $900
Spending in August = 100 u
Spending in September = 100 u - 10 u = 90 u
100 u = 1260
1 u = 1260 ÷ 100 = 12.6
Spending in September
= 90 u
= 90 x 12.6
= $1134
Total spending from July to September
= 900 + 1260 + 1134
= $3294
(b)
Increase in spending in September compared to July
= 1134 - 900
= $234
Percentage increase
=
Increase in spendingSpending in July x 100%
=
234900 x 100%
= 26%
Answer(s): (a) $3294; (b) 26%