PSLE Linda saved $810 in February. This amount was a 10% decrease from what she saved in January. The amount she saved in March was a 30% 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 |
- 10% |
|
February |
90% |
100 u |
Change |
|
+ 30 u |
March |
|
130 u |
(a)
Savings in January = 100%
Savings in February = 100% - 10% = 90%
90% = 810
1% = 810 ÷ 90 = 9
Savings in January
= 100%
= 100 x 9
= $900
Savings in February = 100 u
Savings in March = 100 u + 30 u = 130 u
100 u = 810
1 u = 810 ÷ 100 = 8.1
Savings in March
= 130 u
= 130 x 8.1
= $1053
Total savings from January to March
= 900 + 810 + 1053
= $2763
(b)
Increase in savings in March compared to January
= 1053 - 900
= $153
Percentage increase
=
Increase in savingsSavings in January x 100%
=
153900 x 100%
= 17%
Answer(s): (a) $2763; (b) 17%