PSLE Linda spent $240 in April. This amount was a 20% decrease from what she spent in March. The amount she spent in May was a 15% 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 |
|
+ 15 u |
May |
|
115 u |
(a)
Spending in March = 100%
Spending in April = 100% - 20% = 80%
80% = 240
1% = 240 ÷ 80 = 3
Spending in March
= 100%
= 100 x 3
= $300
Spending in April = 100 u
Spending in May = 100 u + 15 u = 115 u
100 u = 240
1 u = 240 ÷ 100 = 2.4
Spending in May
= 115 u
= 115 x 2.4
= $276
Total spending from March to May
= 300 + 240 + 276
= $816
(b)
Decrease in spending in May compared to March
= 300 - 276
= $24
Percentage decrease
=
Decrease in spendingSpending in March x 100%
=
24300 x 100%
= 8%
Answer(s): (a) $816; (b) 8%