PSLE Linda saved $420 in April. This amount was a 5% increase from what she saved in March. The amount she saved in May was a 40% decrease 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 |
+ 5% |
|
April |
105% |
100 u |
Change |
|
- 40 u |
May |
|
60 u |
(a)
Savings in March = 100%
Savings in April = 100% + 5% = 105%
105% = 420
1% = 420 ÷ 105 = 4
Savings in March
= 100%
= 100 x 4
= $400
Savings in April = 100 u
Savings in May = 100 u - 40 u = 60 u
100 u = 420
1 u = 420 ÷ 100 = 4.2
Savings in May
= 60 u
= 60 x 4.2
= $252
Total savings from March to May
= 400 + 420 + 252
= $1072
(b)
Decrease in savings in May compared to March
= 400 - 252
= $148
Percentage decrease
=
Decrease in savingsSavings in March x 100%
=
148400 x 100%
= 37%
Answer(s): (a) $1072; (b) 37%