PSLE Linda saved $325 in February. This amount was a 35% 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 |
- 35% |
|
February |
65% |
100 u |
Change |
|
+ 20 u |
March |
|
120 u |
(a)
Savings in January = 100%
Savings in February = 100% - 35% = 65%
65% = 325
1% = 325 ÷ 65 = 5
Savings in January
= 100%
= 100 x 5
= $500
Savings in February = 100 u
Savings in March = 100 u + 20 u = 120 u
100 u = 325
1 u = 325 ÷ 100 = 3.25
Savings in March
= 120 u
= 120 x 3.25
= $390
Total savings from January to March
= 500 + 325 + 390
= $1215
(b)
Decrease in savings in March compared to January
= 500 - 390
= $110
Percentage decrease
=
Decrease in savingsSavings in January x 100%
=
110500 x 100%
= 22%
Answer(s): (a) $1215; (b) 22%