PSLE Linda saved $870 in February. This amount was a 45% increase from what she saved in January. The amount she saved in March was a 20% decrease from what she saved in February.
- What was the total amount that Linda saved from January to March?
- What was the percentage increase in the amount Linda saved in March compared to January?
|
Savings |
January |
100% |
|
Change |
+ 45% |
|
February |
145% |
100 u |
Change |
|
- 20 u |
March |
|
80 u |
(a)
Savings in January = 100%
Savings in February = 100% + 45% = 145%
145% = 870
1% = 870 ÷ 145 = 6
Savings in January
= 100%
= 100 x 6
= $600
Savings in February = 100 u
Savings in March = 100 u - 20 u = 80 u
100 u = 870
1 u = 870 ÷ 100 = 8.7
Savings in March
= 80 u
= 80 x 8.7
= $696
Total savings from January to March
= 600 + 870 + 696
= $2166
(b)
Increase in savings in March compared to January
= 696 - 600
= $96
Percentage increase
=
Increase in savingsSavings in January x 100%
=
96600 x 100%
= 16%
Answer(s): (a) $2166; (b) 16%