PSLE Linda saved $450 in September. This amount was a 50% increase from what she saved in August. The amount she saved in October was a 20% 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 |
+ 50% |
|
September |
150% |
100 u |
Change |
|
- 20 u |
October |
|
80 u |
(a)
Savings in August = 100%
Savings in September = 100% + 50% = 150%
150% = 450
1% = 450 ÷ 150 = 3
Savings in August
= 100%
= 100 x 3
= $300
Savings in September = 100 u
Savings in October = 100 u - 20 u = 80 u
100 u = 450
1 u = 450 ÷ 100 = 4.5
Savings in October
= 80 u
= 80 x 4.5
= $360
Total savings from August to October
= 300 + 450 + 360
= $1110
(b)
Increase in savings in October compared to August
= 360 - 300
= $60
Percentage increase
=
Increase in savingsSavings in August x 100%
=
60300 x 100%
= 20%
Answer(s): (a) $1110; (b) 20%