PSLE Linda spent $150 in April. This amount was a 50% decrease from what she spent in March. The amount she spent in May was a 10% 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 |
- 50% |
|
April |
50% |
100 u |
Change |
|
+ 10 u |
May |
|
110 u |
(a)
Spending in March = 100%
Spending in April = 100% - 50% = 50%
50% = 150
1% = 150 ÷ 50 = 3
Spending in March
= 100%
= 100 x 3
= $300
Spending in April = 100 u
Spending in May = 100 u + 10 u = 110 u
100 u = 150
1 u = 150 ÷ 100 = 1.5
Spending in May
= 110 u
= 110 x 1.5
= $165
Total spending from March to May
= 300 + 150 + 165
= $615
(b)
Decrease in spending in May compared to March
= 300 - 165
= $135
Percentage decrease
=
Decrease in spendingSpending in March x 100%
=
135300 x 100%
= 45%
Answer(s): (a) $615; (b) 45%