PSLE Linda saved $640 in February. This amount was a 20% decrease from what she saved in January. The amount she saved in March was a 35% 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 |
|
+ 35 u |
March |
|
135 u |
(a)
Savings in January = 100%
Savings in February = 100% - 20% = 80%
80% = 640
1% = 640 ÷ 80 = 8
Savings in January
= 100%
= 100 x 8
= $800
Savings in February = 100 u
Savings in March = 100 u + 35 u = 135 u
100 u = 640
1 u = 640 ÷ 100 = 6.4
Savings in March
= 135 u
= 135 x 6.4
= $864
Total savings from January to March
= 800 + 640 + 864
= $2304
(b)
Increase in savings in March compared to January
= 864 - 800
= $64
Percentage increase
=
Increase in savingsSavings in January x 100%
=
64800 x 100%
= 8%
Answer(s): (a) $2304; (b) 8%