PSLE Linda spent $480 in April. This amount was a 20% decrease from what she spent in March. The amount she spent in May was a 5% 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 |
- 20% |
|
April |
80% |
100 u |
Change |
|
+ 5 u |
May |
|
105 u |
(a)
Spending in March = 100%
Spending in April = 100% - 20% = 80%
80% = 480
1% = 480 ÷ 80 = 6
Spending in March
= 100%
= 100 x 6
= $600
Spending in April = 100 u
Spending in May = 100 u + 5 u = 105 u
100 u = 480
1 u = 480 ÷ 100 = 4.8
Spending in May
= 105 u
= 105 x 4.8
= $504
Total spending from March to May
= 600 + 480 + 504
= $1584
(b)
Decrease in spending in May compared to March
= 600 - 504
= $96
Percentage decrease
=
Decrease in spendingSpending in March x 100%
=
96600 x 100%
= 16%
Answer(s): (a) $1584; (b) 16%