PSLE Linda saved $100 in April. This amount was a 50% decrease from what she saved in March. The amount she saved in May was a 10% 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 |
- 50% |
|
April |
50% |
100 u |
Change |
|
+ 10 u |
May |
|
110 u |
(a)
Savings in March = 100%
Savings in April = 100% - 50% = 50%
50% = 100
1% = 100 ÷ 50 = 2
Savings in March
= 100%
= 100 x 2
= $200
Savings in April = 100 u
Savings in May = 100 u + 10 u = 110 u
100 u = 100
1 u = 100 ÷ 100 = 1
Savings in May
= 110 u
= 110 x 1
= $110
Total savings from March to May
= 200 + 100 + 110
= $410
(b)
Decrease in savings in May compared to March
= 200 - 110
= $90
Percentage decrease
=
Decrease in savingsSavings in March x 100%
=
90200 x 100%
= 45%
Answer(s): (a) $410; (b) 45%