PSLE Linda saved $840 in February. This amount was a 20% increase from what she saved in January. The amount she saved in March was a 15% 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 |
+ 20% |
|
February |
120% |
100 u |
Change |
|
- 15 u |
March |
|
85 u |
(a)
Savings in January = 100%
Savings in February = 100% + 20% = 120%
120% = 840
1% = 840 ÷ 120 = 7
Savings in January
= 100%
= 100 x 7
= $700
Savings in February = 100 u
Savings in March = 100 u - 15 u = 85 u
100 u = 840
1 u = 840 ÷ 100 = 8.4
Savings in March
= 85 u
= 85 x 8.4
= $714
Total savings from January to March
= 700 + 840 + 714
= $2254
(b)
Increase in savings in March compared to January
= 714 - 700
= $14
Percentage increase
=
Increase in savingsSavings in January x 100%
=
14700 x 100%
= 2%
Answer(s): (a) $2254; (b) 2%