PSLE Linda saved $560 in September. This amount was a 40% increase from what she saved in August. The amount she saved in October was a 10% decrease from what she saved in September.
- What was the total amount that Linda saved from August to October?
- What was the percentage increase in the amount Linda saved in October compared to August?
|
Savings |
August |
100% |
|
Change |
+ 40% |
|
September |
140% |
100 u |
Change |
|
- 10 u |
October |
|
90 u |
(a)
Savings in August = 100%
Savings in September = 100% + 40% = 140%
140% = 560
1% = 560 ÷ 140 = 4
Savings in August
= 100%
= 100 x 4
= $400
Savings in September = 100 u
Savings in October = 100 u - 10 u = 90 u
100 u = 560
1 u = 560 ÷ 100 = 5.6
Savings in October
= 90 u
= 90 x 5.6
= $504
Total savings from August to October
= 400 + 560 + 504
= $1464
(b)
Increase in savings in October compared to August
= 504 - 400
= $104
Percentage increase
=
Increase in savingsSavings in August x 100%
=
104400 x 100%
= 26%
Answer(s): (a) $1464; (b) 26%