PSLE Linda saved $1500 in August. This amount was a 50% increase from what she saved in July. The amount she saved in September was a 20% decrease from what she saved in August.
- What was the total amount that Linda saved from July to September?
- What was the percentage increase in the amount Linda saved in September compared to July?
|
Savings |
July |
100% |
|
Change |
+ 50% |
|
August |
150% |
100 u |
Change |
|
- 20 u |
September |
|
80 u |
(a)
Savings in July = 100%
Savings in August = 100% + 50% = 150%
150% = 1500
1% = 1500 ÷ 150 = 10
Savings in July
= 100%
= 100 x 10
= $1000
Savings in August = 100 u
Savings in September = 100 u - 20 u = 80 u
100 u = 1500
1 u = 1500 ÷ 100 = 15
Savings in September
= 80 u
= 80 x 15
= $1200
Total savings from July to September
= 1000 + 1500 + 1200
= $3700
(b)
Increase in savings in September compared to July
= 1200 - 1000
= $200
Percentage increase
=
Increase in savingsSavings in July x 100%
=
2001000 x 100%
= 20%
Answer(s): (a) $3700; (b) 20%