PSLE Linda spent $595 in June. This amount was a 15% 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 |
- 15% |
|
June |
85% |
100 u |
Change |
|
+ 40 u |
July |
|
140 u |
(a)
Spending in May = 100%
Spending in June = 100% - 15% = 85%
85% = 595
1% = 595 ÷ 85 = 7
Spending in May
= 100%
= 100 x 7
= $700
Spending in June = 100 u
Spending in July = 100 u + 40 u = 140 u
100 u = 595
1 u = 595 ÷ 100 = 5.95
Spending in July
= 140 u
= 140 x 5.95
= $833
Total spending from May to July
= 700 + 595 + 833
= $2128
(b)
Increase in spending in July compared to May
= 833 - 700
= $133
Percentage increase
=
Increase in spendingSpending in May x 100%
=
133700 x 100%
= 19%
Answer(s): (a) $2128; (b) 19%