PSLE Linda saved $160 in June. This amount was a 20% decrease from what she saved in May. The amount she saved in July was a 30% increase from what she saved in June.
- What was the total amount that Linda saved from May to July?
- What was the percentage increase in the amount Linda saved in July compared to May?
|
Savings |
May |
100% |
|
Change |
- 20% |
|
June |
80% |
100 u |
Change |
|
+ 30 u |
July |
|
130 u |
(a)
Savings in May = 100%
Savings in June = 100% - 20% = 80%
80% = 160
1% = 160 ÷ 80 = 2
Savings in May
= 100%
= 100 x 2
= $200
Savings in June = 100 u
Savings in July = 100 u + 30 u = 130 u
100 u = 160
1 u = 160 ÷ 100 = 1.6
Savings in July
= 130 u
= 130 x 1.6
= $208
Total savings from May to July
= 200 + 160 + 208
= $568
(b)
Increase in savings in July compared to May
= 208 - 200
= $8
Percentage increase
=
Increase in savingsSavings in May x 100%
=
8200 x 100%
= 4%
Answer(s): (a) $568; (b) 4%