PSLE Linda saved $750 in February. This amount was a 50% increase from what she saved in January. The amount she saved in March was a 40% decrease from what she saved in February.
- What was the total amount that Linda saved from January to March?
- What was the percentage decrease in the amount Linda saved in March compared to January?
|
Savings |
January |
100% |
|
Change |
+ 50% |
|
February |
150% |
100 u |
Change |
|
- 40 u |
March |
|
60 u |
(a)
Savings in January = 100%
Savings in February = 100% + 50% = 150%
150% = 750
1% = 750 ÷ 150 = 5
Savings in January
= 100%
= 100 x 5
= $500
Savings in February = 100 u
Savings in March = 100 u - 40 u = 60 u
100 u = 750
1 u = 750 ÷ 100 = 7.5
Savings in March
= 60 u
= 60 x 7.5
= $450
Total savings from January to March
= 500 + 750 + 450
= $1700
(b)
Decrease in savings in March compared to January
= 500 - 450
= $50
Percentage decrease
=
Decrease in savingsSavings in January x 100%
=
50500 x 100%
= 10%
Answer(s): (a) $1700; (b) 10%