PSLE Linda saved $1200 in June. This amount was a 20% increase from what she saved in May. The amount she saved in July was a 40% decrease from what she saved in June.
- What was the total amount that Linda saved from May to July?
- What was the percentage decrease in the amount Linda saved in July compared to May?
|
Savings |
May |
100% |
|
Change |
+ 20% |
|
June |
120% |
100 u |
Change |
|
- 40 u |
July |
|
60 u |
(a)
Savings in May = 100%
Savings in June = 100% + 20% = 120%
120% = 1200
1% = 1200 ÷ 120 = 10
Savings in May
= 100%
= 100 x 10
= $1000
Savings in June = 100 u
Savings in July = 100 u - 40 u = 60 u
100 u = 1200
1 u = 1200 ÷ 100 = 12
Savings in July
= 60 u
= 60 x 12
= $720
Total savings from May to July
= 1000 + 1200 + 720
= $2920
(b)
Decrease in savings in July compared to May
= 1000 - 720
= $280
Percentage decrease
=
Decrease in savingsSavings in May x 100%
=
2801000 x 100%
= 28%
Answer(s): (a) $2920; (b) 28%