PSLE Linda saved $425 in February. This amount was a 15% decrease from what she saved in January. The amount she saved in March was a 40% 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 |
- 15% |
|
February |
85% |
100 u |
Change |
|
+ 40 u |
March |
|
140 u |
(a)
Savings in January = 100%
Savings in February = 100% - 15% = 85%
85% = 425
1% = 425 ÷ 85 = 5
Savings in January
= 100%
= 100 x 5
= $500
Savings in February = 100 u
Savings in March = 100 u + 40 u = 140 u
100 u = 425
1 u = 425 ÷ 100 = 4.25
Savings in March
= 140 u
= 140 x 4.25
= $595
Total savings from January to March
= 500 + 425 + 595
= $1520
(b)
Increase in savings in March compared to January
= 595 - 500
= $95
Percentage increase
=
Increase in savingsSavings in January x 100%
=
95500 x 100%
= 19%
Answer(s): (a) $1520; (b) 19%