PSLE Linda saved $880 in November. This amount was a 10% 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 |
+ 10% |
|
November |
110% |
100 u |
Change |
|
- 40 u |
December |
|
60 u |
(a)
Savings in October = 100%
Savings in November = 100% + 10% = 110%
110% = 880
1% = 880 ÷ 110 = 8
Savings in October
= 100%
= 100 x 8
= $800
Savings in November = 100 u
Savings in December = 100 u - 40 u = 60 u
100 u = 880
1 u = 880 ÷ 100 = 8.8
Savings in December
= 60 u
= 60 x 8.8
= $528
Total savings from October to December
= 800 + 880 + 528
= $2208
(b)
Decrease in savings in December compared to October
= 800 - 528
= $272
Percentage decrease
=
Decrease in savingsSavings in October x 100%
=
272800 x 100%
= 34%
Answer(s): (a) $2208; (b) 34%