PSLE Linda saved $810 in March. This amount was a 10% decrease from what she saved in February. The amount she saved in April was a 10% increase from what she saved in March.
- What was the total amount that Linda saved from February to April?
- What was the percentage decrease in the amount Linda saved in April compared to February?
|
Savings |
February |
100% |
|
Change |
- 10% |
|
March |
90% |
100 u |
Change |
|
+ 10 u |
April |
|
110 u |
(a)
Savings in February = 100%
Savings in March = 100% - 10% = 90%
90% = 810
1% = 810 ÷ 90 = 9
Savings in February
= 100%
= 100 x 9
= $900
Savings in March = 100 u
Savings in April = 100 u + 10 u = 110 u
100 u = 810
1 u = 810 ÷ 100 = 8.1
Savings in April
= 110 u
= 110 x 8.1
= $891
Total savings from February to April
= 900 + 810 + 891
= $2601
(b)
Decrease in savings in April compared to February
= 900 - 891
= $9
Percentage decrease
=
Decrease in savingsSavings in February x 100%
=
9900 x 100%
= 1%
Answer(s): (a) $2601; (b) 1%