PSLE Linda spent $240 in April. This amount was a 40% decrease from what she spent in March. The amount she spent in May was a 20% increase from what she spent in April.
- What was the total amount that Linda spent from March to May?
- What was the percentage decrease in the amount Linda spent in May compared to March?
|
Spending |
March |
100% |
|
Change |
- 40% |
|
April |
60% |
100 u |
Change |
|
+ 20 u |
May |
|
120 u |
(a)
Spending in March = 100%
Spending in April = 100% - 40% = 60%
60% = 240
1% = 240 ÷ 60 = 4
Spending in March
= 100%
= 100 x 4
= $400
Spending in April = 100 u
Spending in May = 100 u + 20 u = 120 u
100 u = 240
1 u = 240 ÷ 100 = 2.4
Spending in May
= 120 u
= 120 x 2.4
= $288
Total spending from March to May
= 400 + 240 + 288
= $928
(b)
Decrease in spending in May compared to March
= 400 - 288
= $112
Percentage decrease
=
Decrease in spendingSpending in March x 100%
=
112400 x 100%
= 28%
Answer(s): (a) $928; (b) 28%