PSLE Linda saved $990 in October. This amount was a 10% increase from what she saved in September. The amount she saved in November was a 50% decrease from what she saved in October.
- What was the total amount that Linda saved from September to November?
- What was the percentage decrease in the amount Linda saved in November compared to September?
|
Savings |
September |
100% |
|
Change |
+ 10% |
|
October |
110% |
100 u |
Change |
|
- 50 u |
November |
|
50 u |
(a)
Savings in September = 100%
Savings in October = 100% + 10% = 110%
110% = 990
1% = 990 ÷ 110 = 9
Savings in September
= 100%
= 100 x 9
= $900
Savings in October = 100 u
Savings in November = 100 u - 50 u = 50 u
100 u = 990
1 u = 990 ÷ 100 = 9.9
Savings in November
= 50 u
= 50 x 9.9
= $495
Total savings from September to November
= 900 + 990 + 495
= $2385
(b)
Decrease in savings in November compared to September
= 900 - 495
= $405
Percentage decrease
=
Decrease in savingsSavings in September x 100%
=
405900 x 100%
= 45%
Answer(s): (a) $2385; (b) 45%