PSLE Linda saved $720 in September. This amount was a 10% decrease from what she saved in August. The amount she saved in October was a 40% increase 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 |
- 10% |
|
September |
90% |
100 u |
Change |
|
+ 40 u |
October |
|
140 u |
(a)
Savings in August = 100%
Savings in September = 100% - 10% = 90%
90% = 720
1% = 720 ÷ 90 = 8
Savings in August
= 100%
= 100 x 8
= $800
Savings in September = 100 u
Savings in October = 100 u + 40 u = 140 u
100 u = 720
1 u = 720 ÷ 100 = 7.2
Savings in October
= 140 u
= 140 x 7.2
= $1008
Total savings from August to October
= 800 + 720 + 1008
= $2528
(b)
Increase in savings in October compared to August
= 1008 - 800
= $208
Percentage increase
=
Increase in savingsSavings in August x 100%
=
208800 x 100%
= 26%
Answer(s): (a) $2528; (b) 26%