PSLE Linda saved $1200 in September. This amount was a 50% increase from what she saved in August. The amount she saved in October was a 30% 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 |
|
- 30 u |
October |
|
70 u |
(a)
Savings in August = 100%
Savings in September = 100% + 50% = 150%
150% = 1200
1% = 1200 ÷ 150 = 8
Savings in August
= 100%
= 100 x 8
= $800
Savings in September = 100 u
Savings in October = 100 u - 30 u = 70 u
100 u = 1200
1 u = 1200 ÷ 100 = 12
Savings in October
= 70 u
= 70 x 12
= $840
Total savings from August to October
= 800 + 1200 + 840
= $2840
(b)
Increase in savings in October compared to August
= 840 - 800
= $40
Percentage increase
=
Increase in savingsSavings in August x 100%
=
40800 x 100%
= 5%
Answer(s): (a) $2840; (b) 5%