PSLE Linda saved $360 in April. This amount was a 20% increase from what she saved in March. The amount she saved in May was a 50% 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 |
+ 20% |
|
April |
120% |
100 u |
Change |
|
- 50 u |
May |
|
50 u |
(a)
Savings in March = 100%
Savings in April = 100% + 20% = 120%
120% = 360
1% = 360 ÷ 120 = 3
Savings in March
= 100%
= 100 x 3
= $300
Savings in April = 100 u
Savings in May = 100 u - 50 u = 50 u
100 u = 360
1 u = 360 ÷ 100 = 3.6
Savings in May
= 50 u
= 50 x 3.6
= $180
Total savings from March to May
= 300 + 360 + 180
= $840
(b)
Decrease in savings in May compared to March
= 300 - 180
= $120
Percentage decrease
=
Decrease in savingsSavings in March x 100%
=
120300 x 100%
= 40%
Answer(s): (a) $840; (b) 40%