PSLE Linda saved $1260 in November. This amount was a 40% increase from what she saved in October. The amount she saved in December was a 40% decrease from what she saved in November.
- What was the total amount that Linda saved from October to December?
- What was the percentage decrease in the amount Linda saved in December compared to October?
|
Savings |
October |
100% |
|
Change |
+ 40% |
|
November |
140% |
100 u |
Change |
|
- 40 u |
December |
|
60 u |
(a)
Savings in October = 100%
Savings in November = 100% + 40% = 140%
140% = 1260
1% = 1260 ÷ 140 = 9
Savings in October
= 100%
= 100 x 9
= $900
Savings in November = 100 u
Savings in December = 100 u - 40 u = 60 u
100 u = 1260
1 u = 1260 ÷ 100 = 12.6
Savings in December
= 60 u
= 60 x 12.6
= $756
Total savings from October to December
= 900 + 1260 + 756
= $2916
(b)
Decrease in savings in December compared to October
= 900 - 756
= $144
Percentage decrease
=
Decrease in savingsSavings in October x 100%
=
144900 x 100%
= 16%
Answer(s): (a) $2916; (b) 16%