PSLE Linda spent $810 in April. This amount was a 10% decrease from what she spent in March. The amount she spent in May was a 20% increase from what she spent in April.
- What was the total amount that Linda spent from March to May?
- What was the percentage increase in the amount Linda spent in May compared to March?
|
Spending |
March |
100% |
|
Change |
- 10% |
|
April |
90% |
100 u |
Change |
|
+ 20 u |
May |
|
120 u |
(a)
Spending in March = 100%
Spending in April = 100% - 10% = 90%
90% = 810
1% = 810 ÷ 90 = 9
Spending in March
= 100%
= 100 x 9
= $900
Spending in April = 100 u
Spending in May = 100 u + 20 u = 120 u
100 u = 810
1 u = 810 ÷ 100 = 8.1
Spending in May
= 120 u
= 120 x 8.1
= $972
Total spending from March to May
= 900 + 810 + 972
= $2682
(b)
Increase in spending in May compared to March
= 972 - 900
= $72
Percentage increase
=
Increase in spendingSpending in March x 100%
=
72900 x 100%
= 8%
Answer(s): (a) $2682; (b) 8%