PSLE Linda spent $1100 in April. This amount was a 10% increase from what she spent in March. The amount she spent in May was a 10% decrease 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 |
+ 10% |
|
April |
110% |
100 u |
Change |
|
- 10 u |
May |
|
90 u |
(a)
Spending in March = 100%
Spending in April = 100% + 10% = 110%
110% = 1100
1% = 1100 ÷ 110 = 10
Spending in March
= 100%
= 100 x 10
= $1000
Spending in April = 100 u
Spending in May = 100 u - 10 u = 90 u
100 u = 1100
1 u = 1100 ÷ 100 = 11
Spending in May
= 90 u
= 90 x 11
= $990
Total spending from March to May
= 1000 + 1100 + 990
= $3090
(b)
Decrease in spending in May compared to March
= 1000 - 990
= $10
Percentage decrease
=
Decrease in spendingSpending in March x 100%
=
101000 x 100%
= 1%
Answer(s): (a) $3090; (b) 1%