PSLE Linda saved $640 in June. This amount was a 20% decrease from what she saved in May. The amount she saved in July was a 50% 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 |
|
+ 50 u |
July |
|
150 u |
(a)
Savings in May = 100%
Savings in June = 100% - 20% = 80%
80% = 640
1% = 640 ÷ 80 = 8
Savings in May
= 100%
= 100 x 8
= $800
Savings in June = 100 u
Savings in July = 100 u + 50 u = 150 u
100 u = 640
1 u = 640 ÷ 100 = 6.4
Savings in July
= 150 u
= 150 x 6.4
= $960
Total savings from May to July
= 800 + 640 + 960
= $2400
(b)
Increase in savings in July compared to May
= 960 - 800
= $160
Percentage increase
=
Increase in savingsSavings in May x 100%
=
160800 x 100%
= 20%
Answer(s): (a) $2400; (b) 20%