PSLE Linda saved $500 in August. This amount was a 50% decrease from what she saved in July. The amount she saved in September was a 10% increase from what she saved in August.
- What was the total amount that Linda saved from July to September?
- What was the percentage decrease in the amount Linda saved in September compared to July?
|
Savings |
July |
100% |
|
Change |
- 50% |
|
August |
50% |
100 u |
Change |
|
+ 10 u |
September |
|
110 u |
(a)
Savings in July = 100%
Savings in August = 100% - 50% = 50%
50% = 500
1% = 500 ÷ 50 = 10
Savings in July
= 100%
= 100 x 10
= $1000
Savings in August = 100 u
Savings in September = 100 u + 10 u = 110 u
100 u = 500
1 u = 500 ÷ 100 = 5
Savings in September
= 110 u
= 110 x 5
= $550
Total savings from July to September
= 1000 + 500 + 550
= $2050
(b)
Decrease in savings in September compared to July
= 1000 - 550
= $450
Percentage decrease
=
Decrease in savingsSavings in July x 100%
=
4501000 x 100%
= 45%
Answer(s): (a) $2050; (b) 45%