PSLE Linda spent $380 in June. This amount was a 5% decrease from what she spent in May. The amount she spent in July was a 20% 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 |
- 5% |
|
June |
95% |
100 u |
Change |
|
+ 20 u |
July |
|
120 u |
(a)
Spending in May = 100%
Spending in June = 100% - 5% = 95%
95% = 380
1% = 380 ÷ 95 = 4
Spending in May
= 100%
= 100 x 4
= $400
Spending in June = 100 u
Spending in July = 100 u + 20 u = 120 u
100 u = 380
1 u = 380 ÷ 100 = 3.8
Spending in July
= 120 u
= 120 x 3.8
= $456
Total spending from May to July
= 400 + 380 + 456
= $1236
(b)
Increase in spending in July compared to May
= 456 - 400
= $56
Percentage increase
=
Increase in spendingSpending in May x 100%
=
56400 x 100%
= 14%
Answer(s): (a) $1236; (b) 14%