PSLE Linda saved $850 in September. This amount was a 15% 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 |
- 15% |
|
September |
85% |
100 u |
Change |
|
+ 40 u |
October |
|
140 u |
(a)
Savings in August = 100%
Savings in September = 100% - 15% = 85%
85% = 850
1% = 850 ÷ 85 = 10
Savings in August
= 100%
= 100 x 10
= $1000
Savings in September = 100 u
Savings in October = 100 u + 40 u = 140 u
100 u = 850
1 u = 850 ÷ 100 = 8.5
Savings in October
= 140 u
= 140 x 8.5
= $1190
Total savings from August to October
= 1000 + 850 + 1190
= $3040
(b)
Increase in savings in October compared to August
= 1190 - 1000
= $190
Percentage increase
=
Increase in savingsSavings in August x 100%
=
1901000 x 100%
= 19%
Answer(s): (a) $3040; (b) 19%