PSLE Linda spent $1350 in February. This amount was a 50% 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 |
+ 50% |
|
February |
150% |
100 u |
Change |
|
- 20 u |
March |
|
80 u |
(a)
Spending in January = 100%
Spending in February = 100% + 50% = 150%
150% = 1350
1% = 1350 ÷ 150 = 9
Spending in January
= 100%
= 100 x 9
= $900
Spending in February = 100 u
Spending in March = 100 u - 20 u = 80 u
100 u = 1350
1 u = 1350 ÷ 100 = 13.5
Spending in March
= 80 u
= 80 x 13.5
= $1080
Total spending from January to March
= 900 + 1350 + 1080
= $3330
(b)
Increase in spending in March compared to January
= 1080 - 900
= $180
Percentage increase
=
Increase in spendingSpending in January x 100%
=
180900 x 100%
= 20%
Answer(s): (a) $3330; (b) 20%