PSLE Linda spent $150 in June. This amount was a 25% decrease from what she spent in May. The amount she spent in July was a 40% increase from what she spent in June.
- What was the total amount that Linda spent from May to July?
- What was the percentage increase in the amount Linda spent in July compared to May?
|
Spending |
May |
100% |
|
Change |
- 25% |
|
June |
75% |
100 u |
Change |
|
+ 40 u |
July |
|
140 u |
(a)
Spending in May = 100%
Spending in June = 100% - 25% = 75%
75% = 150
1% = 150 ÷ 75 = 2
Spending in May
= 100%
= 100 x 2
= $200
Spending in June = 100 u
Spending in July = 100 u + 40 u = 140 u
100 u = 150
1 u = 150 ÷ 100 = 1.5
Spending in July
= 140 u
= 140 x 1.5
= $210
Total spending from May to July
= 200 + 150 + 210
= $560
(b)
Increase in spending in July compared to May
= 210 - 200
= $10
Percentage increase
=
Increase in spendingSpending in May x 100%
=
10200 x 100%
= 5%
Answer(s): (a) $560; (b) 5%