PSLE Linda spent $900 in May. This amount was a 10% decrease from what she spent in April. The amount she spent in June was a 10% 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 |
- 10% |
|
May |
90% |
100 u |
Change |
|
+ 10 u |
June |
|
110 u |
(a)
Spending in April = 100%
Spending in May = 100% - 10% = 90%
90% = 900
1% = 900 ÷ 90 = 10
Spending in April
= 100%
= 100 x 10
= $1000
Spending in May = 100 u
Spending in June = 100 u + 10 u = 110 u
100 u = 900
1 u = 900 ÷ 100 = 9
Spending in June
= 110 u
= 110 x 9
= $990
Total spending from April to June
= 1000 + 900 + 990
= $2890
(b)
Decrease in spending in June compared to April
= 1000 - 990
= $10
Percentage decrease
=
Decrease in spendingSpending in April x 100%
=
101000 x 100%
= 1%
Answer(s): (a) $2890; (b) 1%