PSLE Linda saved $640 in April. This amount was a 20% decrease from what she saved in March. The amount she saved in May was a 30% increase from what she saved in April.
- What was the total amount that Linda saved from March to May?
- What was the percentage increase in the amount Linda saved in May compared to March?
|
Savings |
March |
100% |
|
Change |
- 20% |
|
April |
80% |
100 u |
Change |
|
+ 30 u |
May |
|
130 u |
(a)
Savings in March = 100%
Savings in April = 100% - 20% = 80%
80% = 640
1% = 640 ÷ 80 = 8
Savings in March
= 100%
= 100 x 8
= $800
Savings in April = 100 u
Savings in May = 100 u + 30 u = 130 u
100 u = 640
1 u = 640 ÷ 100 = 6.4
Savings in May
= 130 u
= 130 x 6.4
= $832
Total savings from March to May
= 800 + 640 + 832
= $2272
(b)
Increase in savings in May compared to March
= 832 - 800
= $32
Percentage increase
=
Increase in savingsSavings in March x 100%
=
32800 x 100%
= 4%
Answer(s): (a) $2272; (b) 4%