PSLE Linda saved $1450 in September. This amount was a 45% increase from what she saved in August. The amount she saved in October was a 20% decrease 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 |
+ 45% |
|
September |
145% |
100 u |
Change |
|
- 20 u |
October |
|
80 u |
(a)
Savings in August = 100%
Savings in September = 100% + 45% = 145%
145% = 1450
1% = 1450 ÷ 145 = 10
Savings in August
= 100%
= 100 x 10
= $1000
Savings in September = 100 u
Savings in October = 100 u - 20 u = 80 u
100 u = 1450
1 u = 1450 ÷ 100 = 14.5
Savings in October
= 80 u
= 80 x 14.5
= $1160
Total savings from August to October
= 1000 + 1450 + 1160
= $3610
(b)
Increase in savings in October compared to August
= 1160 - 1000
= $160
Percentage increase
=
Increase in savingsSavings in August x 100%
=
1601000 x 100%
= 16%
Answer(s): (a) $3610; (b) 16%