PSLE Linda saved $660 in August. This amount was a 10% increase from what she saved in July. The amount she saved in September was a 50% 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 |
|
- 50 u |
September |
|
50 u |
(a)
Savings in July = 100%
Savings in August = 100% + 10% = 110%
110% = 660
1% = 660 ÷ 110 = 6
Savings in July
= 100%
= 100 x 6
= $600
Savings in August = 100 u
Savings in September = 100 u - 50 u = 50 u
100 u = 660
1 u = 660 ÷ 100 = 6.6
Savings in September
= 50 u
= 50 x 6.6
= $330
Total savings from July to September
= 600 + 660 + 330
= $1590
(b)
Decrease in savings in September compared to July
= 600 - 330
= $270
Percentage decrease
=
Decrease in savingsSavings in July x 100%
=
270600 x 100%
= 45%
Answer(s): (a) $1590; (b) 45%