PSLE Linda saved $900 in September. This amount was a 10% decrease from what she saved in August. The amount she saved in October was a 50% 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 |
- 10% |
|
September |
90% |
100 u |
Change |
|
+ 50 u |
October |
|
150 u |
(a)
Savings in August = 100%
Savings in September = 100% - 10% = 90%
90% = 900
1% = 900 ÷ 90 = 10
Savings in August
= 100%
= 100 x 10
= $1000
Savings in September = 100 u
Savings in October = 100 u + 50 u = 150 u
100 u = 900
1 u = 900 ÷ 100 = 9
Savings in October
= 150 u
= 150 x 9
= $1350
Total savings from August to October
= 1000 + 900 + 1350
= $3250
(b)
Increase in savings in October compared to August
= 1350 - 1000
= $350
Percentage increase
=
Increase in savingsSavings in August x 100%
=
3501000 x 100%
= 35%
Answer(s): (a) $3250; (b) 35%