PSLE Linda saved $665 in November. This amount was a 5% decrease from what she saved in October. The amount she saved in December was a 20% increase 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 |
- 5% |
|
November |
95% |
100 u |
Change |
|
+ 20 u |
December |
|
120 u |
(a)
Savings in October = 100%
Savings in November = 100% - 5% = 95%
95% = 665
1% = 665 ÷ 95 = 7
Savings in October
= 100%
= 100 x 7
= $700
Savings in November = 100 u
Savings in December = 100 u + 20 u = 120 u
100 u = 665
1 u = 665 ÷ 100 = 6.65
Savings in December
= 120 u
= 120 x 6.65
= $798
Total savings from October to December
= 700 + 665 + 798
= $2163
(b)
Increase in savings in December compared to October
= 798 - 700
= $98
Percentage increase
=
Increase in savingsSavings in October x 100%
=
98700 x 100%
= 14%
Answer(s): (a) $2163; (b) 14%