PSLE Linda saved $840 in October. This amount was a 40% increase from what she saved in September. The amount she saved in November was a 25% decrease from what she saved in October.
- What was the total amount that Linda saved from September to November?
- What was the percentage increase in the amount Linda saved in November compared to September?
|
Savings |
September |
100% |
|
Change |
+ 40% |
|
October |
140% |
100 u |
Change |
|
- 25 u |
November |
|
75 u |
(a)
Savings in September = 100%
Savings in October = 100% + 40% = 140%
140% = 840
1% = 840 ÷ 140 = 6
Savings in September
= 100%
= 100 x 6
= $600
Savings in October = 100 u
Savings in November = 100 u - 25 u = 75 u
100 u = 840
1 u = 840 ÷ 100 = 8.4
Savings in November
= 75 u
= 75 x 8.4
= $630
Total savings from September to November
= 600 + 840 + 630
= $2070
(b)
Increase in savings in November compared to September
= 630 - 600
= $30
Percentage increase
=
Increase in savingsSavings in September x 100%
=
30600 x 100%
= 5%
Answer(s): (a) $2070; (b) 5%