PSLE Linda saved $900 in June. This amount was a 10% decrease from what she saved in May. The amount she saved in July was a 20% 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 |
- 10% |
|
June |
90% |
100 u |
Change |
|
+ 20 u |
July |
|
120 u |
(a)
Savings in May = 100%
Savings in June = 100% - 10% = 90%
90% = 900
1% = 900 ÷ 90 = 10
Savings in May
= 100%
= 100 x 10
= $1000
Savings in June = 100 u
Savings in July = 100 u + 20 u = 120 u
100 u = 900
1 u = 900 ÷ 100 = 9
Savings in July
= 120 u
= 120 x 9
= $1080
Total savings from May to July
= 1000 + 900 + 1080
= $2980
(b)
Increase in savings in July compared to May
= 1080 - 1000
= $80
Percentage increase
=
Increase in savingsSavings in May x 100%
=
801000 x 100%
= 8%
Answer(s): (a) $2980; (b) 8%