PSLE Linda saved $520 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% = 520
1% = 520 ÷ 130 = 4
Savings in January
= 100%
= 100 x 4
= $400
Savings in February = 100 u
Savings in March = 100 u - 20 u = 80 u
100 u = 520
1 u = 520 ÷ 100 = 5.2
Savings in March
= 80 u
= 80 x 5.2
= $416
Total savings from January to March
= 400 + 520 + 416
= $1336
(b)
Increase in savings in March compared to January
= 416 - 400
= $16
Percentage increase
=
Increase in savingsSavings in January x 100%
=
16400 x 100%
= 4%
Answer(s): (a) $1336; (b) 4%