PSLE Linda spent $300 in June. This amount was a 40% decrease from what she spent in May. The amount she spent in July was a 45% 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 |
|
+ 45 u |
July |
|
145 u |
(a)
Spending in May = 100%
Spending in June = 100% - 40% = 60%
60% = 300
1% = 300 ÷ 60 = 5
Spending in May
= 100%
= 100 x 5
= $500
Spending in June = 100 u
Spending in July = 100 u + 45 u = 145 u
100 u = 300
1 u = 300 ÷ 100 = 3
Spending in July
= 145 u
= 145 x 3
= $435
Total spending from May to July
= 500 + 300 + 435
= $1235
(b)
Decrease in spending in July compared to May
= 500 - 435
= $65
Percentage decrease
=
Decrease in spendingSpending in May x 100%
=
65500 x 100%
= 13%
Answer(s): (a) $1235; (b) 13%