PSLE Linda spent $720 in June. This amount was a 20% decrease from what she spent in May. The amount she spent in July was a 35% 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 |
|
+ 35 u |
July |
|
135 u |
(a)
Spending in May = 100%
Spending in June = 100% - 20% = 80%
80% = 720
1% = 720 ÷ 80 = 9
Spending in May
= 100%
= 100 x 9
= $900
Spending in June = 100 u
Spending in July = 100 u + 35 u = 135 u
100 u = 720
1 u = 720 ÷ 100 = 7.2
Spending in July
= 135 u
= 135 x 7.2
= $972
Total spending from May to July
= 900 + 720 + 972
= $2592
(b)
Increase in spending in July compared to May
= 972 - 900
= $72
Percentage increase
=
Increase in spendingSpending in May x 100%
=
72900 x 100%
= 8%
Answer(s): (a) $2592; (b) 8%