PSLE Linda spent $240 in June. This amount was a 20% 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 |
- 20% |
|
June |
80% |
100 u |
Change |
|
+ 50 u |
July |
|
150 u |
(a)
Spending in May = 100%
Spending in June = 100% - 20% = 80%
80% = 240
1% = 240 ÷ 80 = 3
Spending in May
= 100%
= 100 x 3
= $300
Spending in June = 100 u
Spending in July = 100 u + 50 u = 150 u
100 u = 240
1 u = 240 ÷ 100 = 2.4
Spending in July
= 150 u
= 150 x 2.4
= $360
Total spending from May to July
= 300 + 240 + 360
= $900
(b)
Increase in spending in July compared to May
= 360 - 300
= $60
Percentage increase
=
Increase in spendingSpending in May x 100%
=
60300 x 100%
= 20%
Answer(s): (a) $900; (b) 20%