PSLE Linda saved $480 in February. This amount was a 40% decrease from what she saved in January. The amount she saved in March was a 35% 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 |
- 40% |
|
February |
60% |
100 u |
Change |
|
+ 35 u |
March |
|
135 u |
(a)
Savings in January = 100%
Savings in February = 100% - 40% = 60%
60% = 480
1% = 480 ÷ 60 = 8
Savings in January
= 100%
= 100 x 8
= $800
Savings in February = 100 u
Savings in March = 100 u + 35 u = 135 u
100 u = 480
1 u = 480 ÷ 100 = 4.8
Savings in March
= 135 u
= 135 x 4.8
= $648
Total savings from January to March
= 800 + 480 + 648
= $1928
(b)
Decrease in savings in March compared to January
= 800 - 648
= $152
Percentage decrease
=
Decrease in savingsSavings in January x 100%
=
152800 x 100%
= 19%
Answer(s): (a) $1928; (b) 19%