PSLE Linda saved $1035 in August. This amount was a 15% increase from what she saved in July. The amount she saved in September was a 20% decrease 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 |
+ 15% |
|
August |
115% |
100 u |
Change |
|
- 20 u |
September |
|
80 u |
(a)
Savings in July = 100%
Savings in August = 100% + 15% = 115%
115% = 1035
1% = 1035 ÷ 115 = 9
Savings in July
= 100%
= 100 x 9
= $900
Savings in August = 100 u
Savings in September = 100 u - 20 u = 80 u
100 u = 1035
1 u = 1035 ÷ 100 = 10.35
Savings in September
= 80 u
= 80 x 10.35
= $828
Total savings from July to September
= 900 + 1035 + 828
= $2763
(b)
Decrease in savings in September compared to July
= 900 - 828
= $72
Percentage decrease
=
Decrease in savingsSavings in July x 100%
=
72900 x 100%
= 8%
Answer(s): (a) $2763; (b) 8%