PSLE Linda saved $280 in October. This amount was a 40% increase from what she saved in September. The amount she saved in November was a 15% 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 |
|
- 15 u |
November |
|
85 u |
(a)
Savings in September = 100%
Savings in October = 100% + 40% = 140%
140% = 280
1% = 280 ÷ 140 = 2
Savings in September
= 100%
= 100 x 2
= $200
Savings in October = 100 u
Savings in November = 100 u - 15 u = 85 u
100 u = 280
1 u = 280 ÷ 100 = 2.8
Savings in November
= 85 u
= 85 x 2.8
= $238
Total savings from September to November
= 200 + 280 + 238
= $718
(b)
Increase in savings in November compared to September
= 238 - 200
= $38
Percentage increase
=
Increase in savingsSavings in September x 100%
=
38200 x 100%
= 19%
Answer(s): (a) $718; (b) 19%