PSLE Linda spent $360 in June. This amount was a 40% 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 decrease in the amount Linda spent in July compared to May?
|
Spending |
May |
100% |
|
Change |
- 40% |
|
June |
60% |
100 u |
Change |
|
+ 40 u |
July |
|
140 u |
(a)
Spending in May = 100%
Spending in June = 100% - 40% = 60%
60% = 360
1% = 360 ÷ 60 = 6
Spending in May
= 100%
= 100 x 6
= $600
Spending in June = 100 u
Spending in July = 100 u + 40 u = 140 u
100 u = 360
1 u = 360 ÷ 100 = 3.6
Spending in July
= 140 u
= 140 x 3.6
= $504
Total spending from May to July
= 600 + 360 + 504
= $1464
(b)
Decrease in spending in July compared to May
= 600 - 504
= $96
Percentage decrease
=
Decrease in spendingSpending in May x 100%
=
96600 x 100%
= 16%
Answer(s): (a) $1464; (b) 16%