PSLE Linda spent $220 in April. This amount was a 45% 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 decrease in the amount Linda spent in May compared to March?
|
Spending |
March |
100% |
|
Change |
- 45% |
|
April |
55% |
100 u |
Change |
|
+ 40 u |
May |
|
140 u |
(a)
Spending in March = 100%
Spending in April = 100% - 45% = 55%
55% = 220
1% = 220 ÷ 55 = 4
Spending in March
= 100%
= 100 x 4
= $400
Spending in April = 100 u
Spending in May = 100 u + 40 u = 140 u
100 u = 220
1 u = 220 ÷ 100 = 2.2
Spending in May
= 140 u
= 140 x 2.2
= $308
Total spending from March to May
= 400 + 220 + 308
= $928
(b)
Decrease in spending in May compared to March
= 400 - 308
= $92
Percentage decrease
=
Decrease in spendingSpending in March x 100%
=
92400 x 100%
= 23%
Answer(s): (a) $928; (b) 23%