PSLE Linda spent $640 in May. This amount was a 20% decrease from what she spent in April. The amount she spent in June was a 5% increase from what she spent in May.
- What was the total amount that Linda spent from April to June?
- What was the percentage decrease in the amount Linda spent in June compared to April?
|
Spending |
April |
100% |
|
Change |
- 20% |
|
May |
80% |
100 u |
Change |
|
+ 5 u |
June |
|
105 u |
(a)
Spending in April = 100%
Spending in May = 100% - 20% = 80%
80% = 640
1% = 640 ÷ 80 = 8
Spending in April
= 100%
= 100 x 8
= $800
Spending in May = 100 u
Spending in June = 100 u + 5 u = 105 u
100 u = 640
1 u = 640 ÷ 100 = 6.4
Spending in June
= 105 u
= 105 x 6.4
= $672
Total spending from April to June
= 800 + 640 + 672
= $2112
(b)
Decrease in spending in June compared to April
= 800 - 672
= $128
Percentage decrease
=
Decrease in spendingSpending in April x 100%
=
128800 x 100%
= 16%
Answer(s): (a) $2112; (b) 16%