PSLE Linda saved $800 in February. This amount was a 20% decrease from what she saved in January. The amount she saved in March was a 40% increase 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 |
- 20% |
|
February |
80% |
100 u |
Change |
|
+ 40 u |
March |
|
140 u |
(a)
Savings in January = 100%
Savings in February = 100% - 20% = 80%
80% = 800
1% = 800 ÷ 80 = 10
Savings in January
= 100%
= 100 x 10
= $1000
Savings in February = 100 u
Savings in March = 100 u + 40 u = 140 u
100 u = 800
1 u = 800 ÷ 100 = 8
Savings in March
= 140 u
= 140 x 8
= $1120
Total savings from January to March
= 1000 + 800 + 1120
= $2920
(b)
Increase in savings in March compared to January
= 1120 - 1000
= $120
Percentage increase
=
Increase in savingsSavings in January x 100%
=
1201000 x 100%
= 12%
Answer(s): (a) $2920; (b) 12%