PSLE Linda saved $980 in September. This amount was a 40% increase from what she saved in August. The amount she saved in October was a 25% 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 |
|
- 25 u |
October |
|
75 u |
(a)
Savings in August = 100%
Savings in September = 100% + 40% = 140%
140% = 980
1% = 980 ÷ 140 = 7
Savings in August
= 100%
= 100 x 7
= $700
Savings in September = 100 u
Savings in October = 100 u - 25 u = 75 u
100 u = 980
1 u = 980 ÷ 100 = 9.8
Savings in October
= 75 u
= 75 x 9.8
= $735
Total savings from August to October
= 700 + 980 + 735
= $2415
(b)
Increase in savings in October compared to August
= 735 - 700
= $35
Percentage increase
=
Increase in savingsSavings in August x 100%
=
35700 x 100%
= 5%
Answer(s): (a) $2415; (b) 5%