PSLE Linda saved $260 in November. This amount was a 30% 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 |
+ 30% |
|
November |
130% |
100 u |
Change |
|
- 20 u |
December |
|
80 u |
(a)
Savings in October = 100%
Savings in November = 100% + 30% = 130%
130% = 260
1% = 260 ÷ 130 = 2
Savings in October
= 100%
= 100 x 2
= $200
Savings in November = 100 u
Savings in December = 100 u - 20 u = 80 u
100 u = 260
1 u = 260 ÷ 100 = 2.6
Savings in December
= 80 u
= 80 x 2.6
= $208
Total savings from October to December
= 200 + 260 + 208
= $668
(b)
Increase in savings in December compared to October
= 208 - 200
= $8
Percentage increase
=
Increase in savingsSavings in October x 100%
=
8200 x 100%
= 4%
Answer(s): (a) $668; (b) 4%