PSLE Linda spent $640 in April. This amount was a 20% 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 |
- 20% |
|
April |
80% |
100 u |
Change |
|
+ 10 u |
May |
|
110 u |
(a)
Spending in March = 100%
Spending in April = 100% - 20% = 80%
80% = 640
1% = 640 ÷ 80 = 8
Spending in March
= 100%
= 100 x 8
= $800
Spending in April = 100 u
Spending in May = 100 u + 10 u = 110 u
100 u = 640
1 u = 640 ÷ 100 = 6.4
Spending in May
= 110 u
= 110 x 6.4
= $704
Total spending from March to May
= 800 + 640 + 704
= $2144
(b)
Decrease in spending in May compared to March
= 800 - 704
= $96
Percentage decrease
=
Decrease in spendingSpending in March x 100%
=
96800 x 100%
= 12%
Answer(s): (a) $2144; (b) 12%