PSLE Linda spent $600 in June. This amount was a 40% decrease from what she spent in May. The amount she spent in July was a 50% 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 |
|
+ 50 u |
July |
|
150 u |
(a)
Spending in May = 100%
Spending in June = 100% - 40% = 60%
60% = 600
1% = 600 ÷ 60 = 10
Spending in May
= 100%
= 100 x 10
= $1000
Spending in June = 100 u
Spending in July = 100 u + 50 u = 150 u
100 u = 600
1 u = 600 ÷ 100 = 6
Spending in July
= 150 u
= 150 x 6
= $900
Total spending from May to July
= 1000 + 600 + 900
= $2500
(b)
Decrease in spending in July compared to May
= 1000 - 900
= $100
Percentage decrease
=
Decrease in spendingSpending in May x 100%
=
1001000 x 100%
= 10%
Answer(s): (a) $2500; (b) 10%