PSLE Linda saved $450 in October. This amount was a 50% increase from what she saved in September. The amount she saved in November was a 30% 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 |
+ 50% |
|
October |
150% |
100 u |
Change |
|
- 30 u |
November |
|
70 u |
(a)
Savings in September = 100%
Savings in October = 100% + 50% = 150%
150% = 450
1% = 450 ÷ 150 = 3
Savings in September
= 100%
= 100 x 3
= $300
Savings in October = 100 u
Savings in November = 100 u - 30 u = 70 u
100 u = 450
1 u = 450 ÷ 100 = 4.5
Savings in November
= 70 u
= 70 x 4.5
= $315
Total savings from September to November
= 300 + 450 + 315
= $1065
(b)
Increase in savings in November compared to September
= 315 - 300
= $15
Percentage increase
=
Increase in savingsSavings in September x 100%
=
15300 x 100%
= 5%
Answer(s): (a) $1065; (b) 5%