PSLE Linda saved $675 in September. This amount was a 35% increase from what she saved in August. The amount she saved in October was a 40% decrease from what she saved in September.
- What was the total amount that Linda saved from August to October?
- What was the percentage decrease in the amount Linda saved in October compared to August?
|
Savings |
August |
100% |
|
Change |
+ 35% |
|
September |
135% |
100 u |
Change |
|
- 40 u |
October |
|
60 u |
(a)
Savings in August = 100%
Savings in September = 100% + 35% = 135%
135% = 675
1% = 675 ÷ 135 = 5
Savings in August
= 100%
= 100 x 5
= $500
Savings in September = 100 u
Savings in October = 100 u - 40 u = 60 u
100 u = 675
1 u = 675 ÷ 100 = 6.75
Savings in October
= 60 u
= 60 x 6.75
= $405
Total savings from August to October
= 500 + 675 + 405
= $1580
(b)
Decrease in savings in October compared to August
= 500 - 405
= $95
Percentage decrease
=
Decrease in savingsSavings in August x 100%
=
95500 x 100%
= 19%
Answer(s): (a) $1580; (b) 19%