PSLE Linda saved $880 in August. This amount was a 10% 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 |
+ 10% |
|
August |
110% |
100 u |
Change |
|
- 20 u |
September |
|
80 u |
(a)
Savings in July = 100%
Savings in August = 100% + 10% = 110%
110% = 880
1% = 880 ÷ 110 = 8
Savings in July
= 100%
= 100 x 8
= $800
Savings in August = 100 u
Savings in September = 100 u - 20 u = 80 u
100 u = 880
1 u = 880 ÷ 100 = 8.8
Savings in September
= 80 u
= 80 x 8.8
= $704
Total savings from July to September
= 800 + 880 + 704
= $2384
(b)
Decrease in savings in September compared to July
= 800 - 704
= $96
Percentage decrease
=
Decrease in savingsSavings in July x 100%
=
96800 x 100%
= 12%
Answer(s): (a) $2384; (b) 12%