PSLE Linda spent $240 in June. This amount was a 40% 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 decrease in the amount Linda spent in July compared to May?
|
Spending |
May |
100% |
|
Change |
- 40% |
|
June |
60% |
100 u |
Change |
|
+ 35 u |
July |
|
135 u |
(a)
Spending in May = 100%
Spending in June = 100% - 40% = 60%
60% = 240
1% = 240 ÷ 60 = 4
Spending in May
= 100%
= 100 x 4
= $400
Spending in June = 100 u
Spending in July = 100 u + 35 u = 135 u
100 u = 240
1 u = 240 ÷ 100 = 2.4
Spending in July
= 135 u
= 135 x 2.4
= $324
Total spending from May to July
= 400 + 240 + 324
= $964
(b)
Decrease in spending in July compared to May
= 400 - 324
= $76
Percentage decrease
=
Decrease in spendingSpending in May x 100%
=
76400 x 100%
= 19%
Answer(s): (a) $964; (b) 19%