PSLE Linda saved $120 in June. This amount was a 40% decrease from what she saved in May. The amount she saved in July was a 10% 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 |
|
+ 10 u |
July |
|
110 u |
(a)
Savings in May = 100%
Savings in June = 100% - 40% = 60%
60% = 120
1% = 120 ÷ 60 = 2
Savings in May
= 100%
= 100 x 2
= $200
Savings in June = 100 u
Savings in July = 100 u + 10 u = 110 u
100 u = 120
1 u = 120 ÷ 100 = 1.2
Savings in July
= 110 u
= 110 x 1.2
= $132
Total savings from May to July
= 200 + 120 + 132
= $452
(b)
Decrease in savings in July compared to May
= 200 - 132
= $68
Percentage decrease
=
Decrease in savingsSavings in May x 100%
=
68200 x 100%
= 34%
Answer(s): (a) $452; (b) 34%