PSLE Linda spent $280 in July. This amount was a 30% decrease from what she spent in June. The amount she spent in August was a 10% 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 |
- 30% |
|
July |
70% |
100 u |
Change |
|
+ 10 u |
August |
|
110 u |
(a)
Spending in June = 100%
Spending in July = 100% - 30% = 70%
70% = 280
1% = 280 ÷ 70 = 4
Spending in June
= 100%
= 100 x 4
= $400
Spending in July = 100 u
Spending in August = 100 u + 10 u = 110 u
100 u = 280
1 u = 280 ÷ 100 = 2.8
Spending in August
= 110 u
= 110 x 2.8
= $308
Total spending from June to August
= 400 + 280 + 308
= $988
(b)
Decrease in spending in August compared to June
= 400 - 308
= $92
Percentage decrease
=
Decrease in spendingSpending in June x 100%
=
92400 x 100%
= 23%
Answer(s): (a) $988; (b) 23%