PSLE Linda spent $360 in June. This amount was a 10% decrease from what she spent in May. The amount she spent in July was a 50% 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 |
- 10% |
|
June |
90% |
100 u |
Change |
|
+ 50 u |
July |
|
150 u |
(a)
Spending in May = 100%
Spending in June = 100% - 10% = 90%
90% = 360
1% = 360 ÷ 90 = 4
Spending in May
= 100%
= 100 x 4
= $400
Spending in June = 100 u
Spending in July = 100 u + 50 u = 150 u
100 u = 360
1 u = 360 ÷ 100 = 3.6
Spending in July
= 150 u
= 150 x 3.6
= $540
Total spending from May to July
= 400 + 360 + 540
= $1300
(b)
Increase in spending in July compared to May
= 540 - 400
= $140
Percentage increase
=
Increase in spendingSpending in May x 100%
=
140400 x 100%
= 35%
Answer(s): (a) $1300; (b) 35%