PSLE Linda saved $490 in April. This amount was a 30% decrease from what she saved in March. The amount she saved in May was a 40% increase from what she saved in April.
- What was the total amount that Linda saved from March to May?
- What was the percentage decrease in the amount Linda saved in May compared to March?
|
Savings |
March |
100% |
|
Change |
- 30% |
|
April |
70% |
100 u |
Change |
|
+ 40 u |
May |
|
140 u |
(a)
Savings in March = 100%
Savings in April = 100% - 30% = 70%
70% = 490
1% = 490 ÷ 70 = 7
Savings in March
= 100%
= 100 x 7
= $700
Savings in April = 100 u
Savings in May = 100 u + 40 u = 140 u
100 u = 490
1 u = 490 ÷ 100 = 4.9
Savings in May
= 140 u
= 140 x 4.9
= $686
Total savings from March to May
= 700 + 490 + 686
= $1876
(b)
Decrease in savings in May compared to March
= 700 - 686
= $14
Percentage decrease
=
Decrease in savingsSavings in March x 100%
=
14700 x 100%
= 2%
Answer(s): (a) $1876; (b) 2%