PSLE Linda saved $280 in November. This amount was a 40% increase from what she saved in October. The amount she saved in December was a 10% 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 |
+ 40% |
|
November |
140% |
100 u |
Change |
|
- 10 u |
December |
|
90 u |
(a)
Savings in October = 100%
Savings in November = 100% + 40% = 140%
140% = 280
1% = 280 ÷ 140 = 2
Savings in October
= 100%
= 100 x 2
= $200
Savings in November = 100 u
Savings in December = 100 u - 10 u = 90 u
100 u = 280
1 u = 280 ÷ 100 = 2.8
Savings in December
= 90 u
= 90 x 2.8
= $252
Total savings from October to December
= 200 + 280 + 252
= $732
(b)
Increase in savings in December compared to October
= 252 - 200
= $52
Percentage increase
=
Increase in savingsSavings in October x 100%
=
52200 x 100%
= 26%
Answer(s): (a) $732; (b) 26%