PSLE Linda saved $405 in November. This amount was a 35% increase from what she saved in October. The amount she saved in December was a 20% decrease from what she saved in November.
- What was the total amount that Linda saved from October to December?
- What was the percentage increase in the amount Linda saved in December compared to October?
|
Savings |
October |
100% |
|
Change |
+ 35% |
|
November |
135% |
100 u |
Change |
|
- 20 u |
December |
|
80 u |
(a)
Savings in October = 100%
Savings in November = 100% + 35% = 135%
135% = 405
1% = 405 ÷ 135 = 3
Savings in October
= 100%
= 100 x 3
= $300
Savings in November = 100 u
Savings in December = 100 u - 20 u = 80 u
100 u = 405
1 u = 405 ÷ 100 = 4.05
Savings in December
= 80 u
= 80 x 4.05
= $324
Total savings from October to December
= 300 + 405 + 324
= $1029
(b)
Increase in savings in December compared to October
= 324 - 300
= $24
Percentage increase
=
Increase in savingsSavings in October x 100%
=
24300 x 100%
= 8%
Answer(s): (a) $1029; (b) 8%