PSLE Linda spent $700 in September. This amount was a 40% increase from what she spent in August. The amount she spent in October was a 15% decrease 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 |
+ 40% |
|
September |
140% |
100 u |
Change |
|
- 15 u |
October |
|
85 u |
(a)
Spending in August = 100%
Spending in September = 100% + 40% = 140%
140% = 700
1% = 700 ÷ 140 = 5
Spending in August
= 100%
= 100 x 5
= $500
Spending in September = 100 u
Spending in October = 100 u - 15 u = 85 u
100 u = 700
1 u = 700 ÷ 100 = 7
Spending in October
= 85 u
= 85 x 7
= $595
Total spending from August to October
= 500 + 700 + 595
= $1795
(b)
Increase in spending in October compared to August
= 595 - 500
= $95
Percentage increase
=
Increase in spendingSpending in August x 100%
=
95500 x 100%
= 19%
Answer(s): (a) $1795; (b) 19%