PSLE Linda spent $770 in April. This amount was a 10% increase from what she spent in March. The amount she spent in May was a 40% decrease 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 |
+ 10% |
|
April |
110% |
100 u |
Change |
|
- 40 u |
May |
|
60 u |
(a)
Spending in March = 100%
Spending in April = 100% + 10% = 110%
110% = 770
1% = 770 ÷ 110 = 7
Spending in March
= 100%
= 100 x 7
= $700
Spending in April = 100 u
Spending in May = 100 u - 40 u = 60 u
100 u = 770
1 u = 770 ÷ 100 = 7.7
Spending in May
= 60 u
= 60 x 7.7
= $462
Total spending from March to May
= 700 + 770 + 462
= $1932
(b)
Decrease in spending in May compared to March
= 700 - 462
= $238
Percentage decrease
=
Decrease in spendingSpending in March x 100%
=
238700 x 100%
= 34%
Answer(s): (a) $1932; (b) 34%