PSLE Linda saved $360 in October. This amount was a 10% decrease from what she saved in September. The amount she saved in November was a 50% increase 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 |
- 10% |
|
October |
90% |
100 u |
Change |
|
+ 50 u |
November |
|
150 u |
(a)
Savings in September = 100%
Savings in October = 100% - 10% = 90%
90% = 360
1% = 360 ÷ 90 = 4
Savings in September
= 100%
= 100 x 4
= $400
Savings in October = 100 u
Savings in November = 100 u + 50 u = 150 u
100 u = 360
1 u = 360 ÷ 100 = 3.6
Savings in November
= 150 u
= 150 x 3.6
= $540
Total savings from September to November
= 400 + 360 + 540
= $1300
(b)
Increase in savings in November compared to September
= 540 - 400
= $140
Percentage increase
=
Increase in savingsSavings in September x 100%
=
140400 x 100%
= 35%
Answer(s): (a) $1300; (b) 35%