PSLE Linda saved $1350 in June. This amount was a 50% increase from what she saved in May. The amount she saved in July was a 20% 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 |
+ 50% |
|
June |
150% |
100 u |
Change |
|
- 20 u |
July |
|
80 u |
(a)
Savings in May = 100%
Savings in June = 100% + 50% = 150%
150% = 1350
1% = 1350 ÷ 150 = 9
Savings in May
= 100%
= 100 x 9
= $900
Savings in June = 100 u
Savings in July = 100 u - 20 u = 80 u
100 u = 1350
1 u = 1350 ÷ 100 = 13.5
Savings in July
= 80 u
= 80 x 13.5
= $1080
Total savings from May to July
= 900 + 1350 + 1080
= $3330
(b)
Increase in savings in July compared to May
= 1080 - 900
= $180
Percentage increase
=
Increase in savingsSavings in May x 100%
=
180900 x 100%
= 20%
Answer(s): (a) $3330; (b) 20%