PSLE Linda spent $1400 in June. This amount was a 40% increase from what she spent in May. The amount she spent in July was a 30% decrease 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 |
140% |
100 u |
Change |
|
- 30 u |
July |
|
70 u |
(a)
Spending in May = 100%
Spending in June = 100% + 40% = 140%
140% = 1400
1% = 1400 ÷ 140 = 10
Spending in May
= 100%
= 100 x 10
= $1000
Spending in June = 100 u
Spending in July = 100 u - 30 u = 70 u
100 u = 1400
1 u = 1400 ÷ 100 = 14
Spending in July
= 70 u
= 70 x 14
= $980
Total spending from May to July
= 1000 + 1400 + 980
= $3380
(b)
Decrease in spending in July compared to May
= 1000 - 980
= $20
Percentage decrease
=
Decrease in spendingSpending in May x 100%
=
201000 x 100%
= 2%
Answer(s): (a) $3380; (b) 2%