PSLE Linda saved $720 in March. This amount was a 10% decrease from what she saved in February. The amount she saved in April was a 20% increase from what she saved in March.
- What was the total amount that Linda saved from February to April?
- What was the percentage increase in the amount Linda saved in April compared to February?
|
Savings |
February |
100% |
|
Change |
- 10% |
|
March |
90% |
100 u |
Change |
|
+ 20 u |
April |
|
120 u |
(a)
Savings in February = 100%
Savings in March = 100% - 10% = 90%
90% = 720
1% = 720 ÷ 90 = 8
Savings in February
= 100%
= 100 x 8
= $800
Savings in March = 100 u
Savings in April = 100 u + 20 u = 120 u
100 u = 720
1 u = 720 ÷ 100 = 7.2
Savings in April
= 120 u
= 120 x 7.2
= $864
Total savings from February to April
= 800 + 720 + 864
= $2384
(b)
Increase in savings in April compared to February
= 864 - 800
= $64
Percentage increase
=
Increase in savingsSavings in February x 100%
=
64800 x 100%
= 8%
Answer(s): (a) $2384; (b) 8%