PSLE Linda spent $650 in February. This amount was a 30% increase from what she spent in January. The amount she spent in March was a 20% decrease 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 |
+ 30% |
|
February |
130% |
100 u |
Change |
|
- 20 u |
March |
|
80 u |
(a)
Spending in January = 100%
Spending in February = 100% + 30% = 130%
130% = 650
1% = 650 ÷ 130 = 5
Spending in January
= 100%
= 100 x 5
= $500
Spending in February = 100 u
Spending in March = 100 u - 20 u = 80 u
100 u = 650
1 u = 650 ÷ 100 = 6.5
Spending in March
= 80 u
= 80 x 6.5
= $520
Total spending from January to March
= 500 + 650 + 520
= $1670
(b)
Increase in spending in March compared to January
= 520 - 500
= $20
Percentage increase
=
Increase in spendingSpending in January x 100%
=
20500 x 100%
= 4%
Answer(s): (a) $1670; (b) 4%