PSLE Linda saved $220 in February. This amount was a 10% 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 decrease in the amount Linda saved in March compared to January?
|
Savings |
January |
100% |
|
Change |
+ 10% |
|
February |
110% |
100 u |
Change |
|
- 20 u |
March |
|
80 u |
(a)
Savings in January = 100%
Savings in February = 100% + 10% = 110%
110% = 220
1% = 220 ÷ 110 = 2
Savings in January
= 100%
= 100 x 2
= $200
Savings in February = 100 u
Savings in March = 100 u - 20 u = 80 u
100 u = 220
1 u = 220 ÷ 100 = 2.2
Savings in March
= 80 u
= 80 x 2.2
= $176
Total savings from January to March
= 200 + 220 + 176
= $596
(b)
Decrease in savings in March compared to January
= 200 - 176
= $24
Percentage decrease
=
Decrease in savingsSavings in January x 100%
=
24200 x 100%
= 12%
Answer(s): (a) $596; (b) 12%