PSLE Linda saved $400 in September. This amount was a 20% decrease from what she saved in August. The amount she saved in October was a 45% 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 |
- 20% |
|
September |
80% |
100 u |
Change |
|
+ 45 u |
October |
|
145 u |
(a)
Savings in August = 100%
Savings in September = 100% - 20% = 80%
80% = 400
1% = 400 ÷ 80 = 5
Savings in August
= 100%
= 100 x 5
= $500
Savings in September = 100 u
Savings in October = 100 u + 45 u = 145 u
100 u = 400
1 u = 400 ÷ 100 = 4
Savings in October
= 145 u
= 145 x 4
= $580
Total savings from August to October
= 500 + 400 + 580
= $1480
(b)
Increase in savings in October compared to August
= 580 - 500
= $80
Percentage increase
=
Increase in savingsSavings in August x 100%
=
80500 x 100%
= 16%
Answer(s): (a) $1480; (b) 16%