PSLE Linda saved $1080 in June. This amount was a 20% increase from what she saved in May. The amount she saved in July was a 10% decrease 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 |
120% |
100 u |
Change |
|
- 10 u |
July |
|
90 u |
(a)
Savings in May = 100%
Savings in June = 100% + 20% = 120%
120% = 1080
1% = 1080 ÷ 120 = 9
Savings in May
= 100%
= 100 x 9
= $900
Savings in June = 100 u
Savings in July = 100 u - 10 u = 90 u
100 u = 1080
1 u = 1080 ÷ 100 = 10.8
Savings in July
= 90 u
= 90 x 10.8
= $972
Total savings from May to July
= 900 + 1080 + 972
= $2952
(b)
Increase in savings in July compared to May
= 972 - 900
= $72
Percentage increase
=
Increase in savingsSavings in May x 100%
=
72900 x 100%
= 8%
Answer(s): (a) $2952; (b) 8%