PSLE Linda saved $1120 in February. This amount was a 40% 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 |
+ 40% |
|
February |
140% |
100 u |
Change |
|
- 15 u |
March |
|
85 u |
(a)
Savings in January = 100%
Savings in February = 100% + 40% = 140%
140% = 1120
1% = 1120 ÷ 140 = 8
Savings in January
= 100%
= 100 x 8
= $800
Savings in February = 100 u
Savings in March = 100 u - 15 u = 85 u
100 u = 1120
1 u = 1120 ÷ 100 = 11.2
Savings in March
= 85 u
= 85 x 11.2
= $952
Total savings from January to March
= 800 + 1120 + 952
= $2872
(b)
Increase in savings in March compared to January
= 952 - 800
= $152
Percentage increase
=
Increase in savingsSavings in January x 100%
=
152800 x 100%
= 19%
Answer(s): (a) $2872; (b) 19%