PSLE Linda spent $1200 in April. This amount was a 20% increase from what she spent in March. The amount she spent in May was a 15% decrease from what she spent in April.
- What was the total amount that Linda spent from March to May?
- What was the percentage increase in the amount Linda spent in May compared to March?
|
Spending |
March |
100% |
|
Change |
+ 20% |
|
April |
120% |
100 u |
Change |
|
- 15 u |
May |
|
85 u |
(a)
Spending in March = 100%
Spending in April = 100% + 20% = 120%
120% = 1200
1% = 1200 ÷ 120 = 10
Spending in March
= 100%
= 100 x 10
= $1000
Spending in April = 100 u
Spending in May = 100 u - 15 u = 85 u
100 u = 1200
1 u = 1200 ÷ 100 = 12
Spending in May
= 85 u
= 85 x 12
= $1020
Total spending from March to May
= 1000 + 1200 + 1020
= $3220
(b)
Increase in spending in May compared to March
= 1020 - 1000
= $20
Percentage increase
=
Increase in spendingSpending in March x 100%
=
201000 x 100%
= 2%
Answer(s): (a) $3220; (b) 2%