PSLE Linda saved $980 in June. This amount was a 40% increase from what she saved in May. The amount she saved in July was a 35% decrease 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 |
+ 40% |
|
June |
140% |
100 u |
Change |
|
- 35 u |
July |
|
65 u |
(a)
Savings in May = 100%
Savings in June = 100% + 40% = 140%
140% = 980
1% = 980 ÷ 140 = 7
Savings in May
= 100%
= 100 x 7
= $700
Savings in June = 100 u
Savings in July = 100 u - 35 u = 65 u
100 u = 980
1 u = 980 ÷ 100 = 9.8
Savings in July
= 65 u
= 65 x 9.8
= $637
Total savings from May to July
= 700 + 980 + 637
= $2317
(b)
Decrease in savings in July compared to May
= 700 - 637
= $63
Percentage decrease
=
Decrease in savingsSavings in May x 100%
=
63700 x 100%
= 9%
Answer(s): (a) $2317; (b) 9%