PSLE Linda spent $450 in April. This amount was a 10% decrease from what she spent in March. The amount she spent in May was a 40% increase from what she spent in April.
- What was the total amount that Linda spent from March to May?
- What was the percentage increase in the amount Linda spent in May compared to March?
|
Spending |
March |
100% |
|
Change |
- 10% |
|
April |
90% |
100 u |
Change |
|
+ 40 u |
May |
|
140 u |
(a)
Spending in March = 100%
Spending in April = 100% - 10% = 90%
90% = 450
1% = 450 ÷ 90 = 5
Spending in March
= 100%
= 100 x 5
= $500
Spending in April = 100 u
Spending in May = 100 u + 40 u = 140 u
100 u = 450
1 u = 450 ÷ 100 = 4.5
Spending in May
= 140 u
= 140 x 4.5
= $630
Total spending from March to May
= 500 + 450 + 630
= $1580
(b)
Increase in spending in May compared to March
= 630 - 500
= $130
Percentage increase
=
Increase in spendingSpending in March x 100%
=
130500 x 100%
= 26%
Answer(s): (a) $1580; (b) 26%