PSLE Linda spent $1260 in September. This amount was a 40% increase from what she spent in August. The amount she spent in October was a 35% decrease from what she spent in September.
- What was the total amount that Linda spent from August to October?
- What was the percentage decrease in the amount Linda spent in October compared to August?
|
Spending |
August |
100% |
|
Change |
+ 40% |
|
September |
140% |
100 u |
Change |
|
- 35 u |
October |
|
65 u |
(a)
Spending in August = 100%
Spending in September = 100% + 40% = 140%
140% = 1260
1% = 1260 ÷ 140 = 9
Spending in August
= 100%
= 100 x 9
= $900
Spending in September = 100 u
Spending in October = 100 u - 35 u = 65 u
100 u = 1260
1 u = 1260 ÷ 100 = 12.6
Spending in October
= 65 u
= 65 x 12.6
= $819
Total spending from August to October
= 900 + 1260 + 819
= $2979
(b)
Decrease in spending in October compared to August
= 900 - 819
= $81
Percentage decrease
=
Decrease in spendingSpending in August x 100%
=
81900 x 100%
= 9%
Answer(s): (a) $2979; (b) 9%