PSLE Linda saved $560 in November. This amount was a 40% increase from what she saved in October. The amount she saved in December was a 25% 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 |
|
- 25 u |
December |
|
75 u |
(a)
Savings in October = 100%
Savings in November = 100% + 40% = 140%
140% = 560
1% = 560 ÷ 140 = 4
Savings in October
= 100%
= 100 x 4
= $400
Savings in November = 100 u
Savings in December = 100 u - 25 u = 75 u
100 u = 560
1 u = 560 ÷ 100 = 5.6
Savings in December
= 75 u
= 75 x 5.6
= $420
Total savings from October to December
= 400 + 560 + 420
= $1380
(b)
Increase in savings in December compared to October
= 420 - 400
= $20
Percentage increase
=
Increase in savingsSavings in October x 100%
=
20400 x 100%
= 5%
Answer(s): (a) $1380; (b) 5%