PSLE Linda spent $540 in April. This amount was a 40% decrease from what she spent in March. The amount she spent in May was a 45% 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 |
- 40% |
|
April |
60% |
100 u |
Change |
|
+ 45 u |
May |
|
145 u |
(a)
Spending in March = 100%
Spending in April = 100% - 40% = 60%
60% = 540
1% = 540 ÷ 60 = 9
Spending in March
= 100%
= 100 x 9
= $900
Spending in April = 100 u
Spending in May = 100 u + 45 u = 145 u
100 u = 540
1 u = 540 ÷ 100 = 5.4
Spending in May
= 145 u
= 145 x 5.4
= $783
Total spending from March to May
= 900 + 540 + 783
= $2223
(b)
Decrease in spending in May compared to March
= 900 - 783
= $117
Percentage decrease
=
Decrease in spendingSpending in March x 100%
=
117900 x 100%
= 13%
Answer(s): (a) $2223; (b) 13%