PSLE Linda saved $300 in February. This amount was a 25% decrease from what she saved in January. The amount she saved in March was a 20% increase from what she saved in February.
- What was the total amount that Linda saved from January to March?
- What was the percentage decrease in the amount Linda saved in March compared to January?
|
Savings |
January |
100% |
|
Change |
- 25% |
|
February |
75% |
100 u |
Change |
|
+ 20 u |
March |
|
120 u |
(a)
Savings in January = 100%
Savings in February = 100% - 25% = 75%
75% = 300
1% = 300 ÷ 75 = 4
Savings in January
= 100%
= 100 x 4
= $400
Savings in February = 100 u
Savings in March = 100 u + 20 u = 120 u
100 u = 300
1 u = 300 ÷ 100 = 3
Savings in March
= 120 u
= 120 x 3
= $360
Total savings from January to March
= 400 + 300 + 360
= $1060
(b)
Decrease in savings in March compared to January
= 400 - 360
= $40
Percentage decrease
=
Decrease in savingsSavings in January x 100%
=
40400 x 100%
= 10%
Answer(s): (a) $1060; (b) 10%