PSLE Linda saved $360 in April. This amount was a 10% decrease from what she saved in March. The amount she saved in May was a 20% 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 |
- 10% |
|
April |
90% |
100 u |
Change |
|
+ 20 u |
May |
|
120 u |
(a)
Savings in March = 100%
Savings in April = 100% - 10% = 90%
90% = 360
1% = 360 ÷ 90 = 4
Savings in March
= 100%
= 100 x 4
= $400
Savings in April = 100 u
Savings in May = 100 u + 20 u = 120 u
100 u = 360
1 u = 360 ÷ 100 = 3.6
Savings in May
= 120 u
= 120 x 3.6
= $432
Total savings from March to May
= 400 + 360 + 432
= $1192
(b)
Increase in savings in May compared to March
= 432 - 400
= $32
Percentage increase
=
Increase in savingsSavings in March x 100%
=
32400 x 100%
= 8%
Answer(s): (a) $1192; (b) 8%