PSLE Linda saved $420 in June. This amount was a 40% decrease from what she saved in May. The amount she saved in July was a 45% increase 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 |
- 40% |
|
June |
60% |
100 u |
Change |
|
+ 45 u |
July |
|
145 u |
(a)
Savings in May = 100%
Savings in June = 100% - 40% = 60%
60% = 420
1% = 420 ÷ 60 = 7
Savings in May
= 100%
= 100 x 7
= $700
Savings in June = 100 u
Savings in July = 100 u + 45 u = 145 u
100 u = 420
1 u = 420 ÷ 100 = 4.2
Savings in July
= 145 u
= 145 x 4.2
= $609
Total savings from May to July
= 700 + 420 + 609
= $1729
(b)
Decrease in savings in July compared to May
= 700 - 609
= $91
Percentage decrease
=
Decrease in savingsSavings in May x 100%
=
91700 x 100%
= 13%
Answer(s): (a) $1729; (b) 13%