PSLE Linda spent $1300 in June. This amount was a 30% increase from what she spent in May. The amount she spent in July was a 20% decrease 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 |
+ 30% |
|
June |
130% |
100 u |
Change |
|
- 20 u |
July |
|
80 u |
(a)
Spending in May = 100%
Spending in June = 100% + 30% = 130%
130% = 1300
1% = 1300 ÷ 130 = 10
Spending in May
= 100%
= 100 x 10
= $1000
Spending in June = 100 u
Spending in July = 100 u - 20 u = 80 u
100 u = 1300
1 u = 1300 ÷ 100 = 13
Spending in July
= 80 u
= 80 x 13
= $1040
Total spending from May to July
= 1000 + 1300 + 1040
= $3340
(b)
Increase in spending in July compared to May
= 1040 - 1000
= $40
Percentage increase
=
Increase in spendingSpending in May x 100%
=
401000 x 100%
= 4%
Answer(s): (a) $3340; (b) 4%