PSLE Linda saved $1450 in October. This amount was a 45% increase from what she saved in September. The amount she saved in November was a 40% decrease from what she saved in October.
- What was the total amount that Linda saved from September to November?
- What was the percentage decrease in the amount Linda saved in November compared to September?
|
Savings |
September |
100% |
|
Change |
+ 45% |
|
October |
145% |
100 u |
Change |
|
- 40 u |
November |
|
60 u |
(a)
Savings in September = 100%
Savings in October = 100% + 45% = 145%
145% = 1450
1% = 1450 ÷ 145 = 10
Savings in September
= 100%
= 100 x 10
= $1000
Savings in October = 100 u
Savings in November = 100 u - 40 u = 60 u
100 u = 1450
1 u = 1450 ÷ 100 = 14.5
Savings in November
= 60 u
= 60 x 14.5
= $870
Total savings from September to November
= 1000 + 1450 + 870
= $3320
(b)
Decrease in savings in November compared to September
= 1000 - 870
= $130
Percentage decrease
=
Decrease in savingsSavings in September x 100%
=
1301000 x 100%
= 13%
Answer(s): (a) $3320; (b) 13%