PSLE Linda saved $1400 in September. This amount was a 40% 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 |
+ 40% |
|
September |
140% |
100 u |
Change |
|
- 40 u |
October |
|
60 u |
(a)
Savings in August = 100%
Savings in September = 100% + 40% = 140%
140% = 1400
1% = 1400 ÷ 140 = 10
Savings in August
= 100%
= 100 x 10
= $1000
Savings in September = 100 u
Savings in October = 100 u - 40 u = 60 u
100 u = 1400
1 u = 1400 ÷ 100 = 14
Savings in October
= 60 u
= 60 x 14
= $840
Total savings from August to October
= 1000 + 1400 + 840
= $3240
(b)
Decrease in savings in October compared to August
= 1000 - 840
= $160
Percentage decrease
=
Decrease in savingsSavings in August x 100%
=
1601000 x 100%
= 16%
Answer(s): (a) $3240; (b) 16%