PSLE Linda saved $1260 in February. This amount was a 40% 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 |
+ 40% |
|
February |
140% |
100 u |
Change |
|
- 20 u |
March |
|
80 u |
(a)
Savings in January = 100%
Savings in February = 100% + 40% = 140%
140% = 1260
1% = 1260 ÷ 140 = 9
Savings in January
= 100%
= 100 x 9
= $900
Savings in February = 100 u
Savings in March = 100 u - 20 u = 80 u
100 u = 1260
1 u = 1260 ÷ 100 = 12.6
Savings in March
= 80 u
= 80 x 12.6
= $1008
Total savings from January to March
= 900 + 1260 + 1008
= $3168
(b)
Increase in savings in March compared to January
= 1008 - 900
= $108
Percentage increase
=
Increase in savingsSavings in January x 100%
=
108900 x 100%
= 12%
Answer(s): (a) $3168; (b) 12%