PSLE Linda saved $350 in June. This amount was a 50% 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 decrease in the amount Linda saved in July compared to May?
|
Savings |
May |
100% |
|
Change |
- 50% |
|
June |
50% |
100 u |
Change |
|
+ 20 u |
July |
|
120 u |
(a)
Savings in May = 100%
Savings in June = 100% - 50% = 50%
50% = 350
1% = 350 ÷ 50 = 7
Savings in May
= 100%
= 100 x 7
= $700
Savings in June = 100 u
Savings in July = 100 u + 20 u = 120 u
100 u = 350
1 u = 350 ÷ 100 = 3.5
Savings in July
= 120 u
= 120 x 3.5
= $420
Total savings from May to July
= 700 + 350 + 420
= $1470
(b)
Decrease in savings in July compared to May
= 700 - 420
= $280
Percentage decrease
=
Decrease in savingsSavings in May x 100%
=
280700 x 100%
= 40%
Answer(s): (a) $1470; (b) 40%