PSLE Linda saved $300 in October. This amount was a 40% decrease from what she saved in September. The amount she saved in November was a 25% increase from what she saved in October.
- What was the total amount that Linda saved from September to November?
- What was the percentage decrease in the amount Linda saved in November compared to September?
|
Savings |
September |
100% |
|
Change |
- 40% |
|
October |
60% |
100 u |
Change |
|
+ 25 u |
November |
|
125 u |
(a)
Savings in September = 100%
Savings in October = 100% - 40% = 60%
60% = 300
1% = 300 ÷ 60 = 5
Savings in September
= 100%
= 100 x 5
= $500
Savings in October = 100 u
Savings in November = 100 u + 25 u = 125 u
100 u = 300
1 u = 300 ÷ 100 = 3
Savings in November
= 125 u
= 125 x 3
= $375
Total savings from September to November
= 500 + 300 + 375
= $1175
(b)
Decrease in savings in November compared to September
= 500 - 375
= $125
Percentage decrease
=
Decrease in savingsSavings in September x 100%
=
125500 x 100%
= 25%
Answer(s): (a) $1175; (b) 25%