PSLE Linda saved $1040 in February. This amount was a 30% increase from what she saved in January. The amount she saved in March was a 20% decrease from what she saved in February.
- What was the total amount that Linda saved from January to March?
- What was the percentage increase in the amount Linda saved in March compared to January?
|
Savings |
January |
100% |
|
Change |
+ 30% |
|
February |
130% |
100 u |
Change |
|
- 20 u |
March |
|
80 u |
(a)
Savings in January = 100%
Savings in February = 100% + 30% = 130%
130% = 1040
1% = 1040 ÷ 130 = 8
Savings in January
= 100%
= 100 x 8
= $800
Savings in February = 100 u
Savings in March = 100 u - 20 u = 80 u
100 u = 1040
1 u = 1040 ÷ 100 = 10.4
Savings in March
= 80 u
= 80 x 10.4
= $832
Total savings from January to March
= 800 + 1040 + 832
= $2672
(b)
Increase in savings in March compared to January
= 832 - 800
= $32
Percentage increase
=
Increase in savingsSavings in January x 100%
=
32800 x 100%
= 4%
Answer(s): (a) $2672; (b) 4%