PSLE Linda spent $800 in July. This amount was a 20% decrease from what she spent in June. The amount she spent in August was a 5% increase from what she spent in July.
- What was the total amount that Linda spent from June to August?
- What was the percentage decrease in the amount Linda spent in August compared to June?
|
Spending |
June |
100% |
|
Change |
- 20% |
|
July |
80% |
100 u |
Change |
|
+ 5 u |
August |
|
105 u |
(a)
Spending in June = 100%
Spending in July = 100% - 20% = 80%
80% = 800
1% = 800 ÷ 80 = 10
Spending in June
= 100%
= 100 x 10
= $1000
Spending in July = 100 u
Spending in August = 100 u + 5 u = 105 u
100 u = 800
1 u = 800 ÷ 100 = 8
Spending in August
= 105 u
= 105 x 8
= $840
Total spending from June to August
= 1000 + 800 + 840
= $2640
(b)
Decrease in spending in August compared to June
= 1000 - 840
= $160
Percentage decrease
=
Decrease in spendingSpending in June x 100%
=
1601000 x 100%
= 16%
Answer(s): (a) $2640; (b) 16%