PSLE Linda spent $800 in February. This amount was a 20% decrease from what she spent in January. The amount she spent in March was a 50% increase from what she spent in February.
- What was the total amount that Linda spent from January to March?
- What was the percentage increase in the amount Linda spent in March compared to January?
|
Spending |
January |
100% |
|
Change |
- 20% |
|
February |
80% |
100 u |
Change |
|
+ 50 u |
March |
|
150 u |
(a)
Spending in January = 100%
Spending in February = 100% - 20% = 80%
80% = 800
1% = 800 ÷ 80 = 10
Spending in January
= 100%
= 100 x 10
= $1000
Spending in February = 100 u
Spending in March = 100 u + 50 u = 150 u
100 u = 800
1 u = 800 ÷ 100 = 8
Spending in March
= 150 u
= 150 x 8
= $1200
Total spending from January to March
= 1000 + 800 + 1200
= $3000
(b)
Increase in spending in March compared to January
= 1200 - 1000
= $200
Percentage increase
=
Increase in spendingSpending in January x 100%
=
2001000 x 100%
= 20%
Answer(s): (a) $3000; (b) 20%