PSLE Linda saved $1015 in September. This amount was a 45% 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 |
+ 45% |
|
September |
145% |
100 u |
Change |
|
- 40 u |
October |
|
60 u |
(a)
Savings in August = 100%
Savings in September = 100% + 45% = 145%
145% = 1015
1% = 1015 ÷ 145 = 7
Savings in August
= 100%
= 100 x 7
= $700
Savings in September = 100 u
Savings in October = 100 u - 40 u = 60 u
100 u = 1015
1 u = 1015 ÷ 100 = 10.15
Savings in October
= 60 u
= 60 x 10.15
= $609
Total savings from August to October
= 700 + 1015 + 609
= $2324
(b)
Decrease in savings in October compared to August
= 700 - 609
= $91
Percentage decrease
=
Decrease in savingsSavings in August x 100%
=
91700 x 100%
= 13%
Answer(s): (a) $2324; (b) 13%