PSLE Linda spent $960 in July. This amount was a 20% increase from what she spent in June. The amount she spent in August was a 15% decrease from what she spent in July.
- What was the total amount that Linda spent from June to August?
- What was the percentage increase in the amount Linda spent in August compared to June?
|
Spending |
June |
100% |
|
Change |
+ 20% |
|
July |
120% |
100 u |
Change |
|
- 15 u |
August |
|
85 u |
(a)
Spending in June = 100%
Spending in July = 100% + 20% = 120%
120% = 960
1% = 960 ÷ 120 = 8
Spending in June
= 100%
= 100 x 8
= $800
Spending in July = 100 u
Spending in August = 100 u - 15 u = 85 u
100 u = 960
1 u = 960 ÷ 100 = 9.6
Spending in August
= 85 u
= 85 x 9.6
= $816
Total spending from June to August
= 800 + 960 + 816
= $2576
(b)
Increase in spending in August compared to June
= 816 - 800
= $16
Percentage increase
=
Increase in spendingSpending in June x 100%
=
16800 x 100%
= 2%
Answer(s): (a) $2576; (b) 2%