The relative decrease change. Definition:
The relative decrease change is the difference in an indicator over two periods in time, v1 - v2, relative to the value of the indicator in the earlier period, v1.
- Where:
- v1 - is called the reference value (original, initial number);
- v2 - is called the new value (the end value).
- In our case: v1 = 28,712.14, v2 = 63,962.32.
The relative decrease change. Formula:
The relative decrease change =
The actual change / |v1|
(v1 - v2) / |v1| =
- Legend:
- v1 - the original number
- |v1| - the positive value of v1, |v1| >= 0. By example: |10| = 10; |-10| = 10.
- v2 - the new value
- The actual change = v1 - v2
- / - the fraction bar (division)
Why do we use |v1| in the formula instead of v1?
- Let's see what happens if we use v1 instead of |v1|:
- Choose a random negative number as the initial value: - 28.
- Choose a random positive number for the end value: 80.
Formula and calculation:
(v1 - v2) / v1 =
(- 28 - 80) / - 28 =
-108 / - 28 ≈
3.857142857143 ≈
3.86
Although the absolute difference is negative: -108, the relative decrease change is positive: 3.86. By using |v1| instead of v1, the error is corrected.
The relative percent decrease change. Detailed calculations below
By multiplying a number by the fraction 100/100,
we change only the form of the result, not the result.
- 100/100 = 100% = 100 ÷ 100 = 1.
- n × 100/100 = (n × 100)/100 = (n × 100)%, any number.
The relative percent decrease change. Formula:
The relative percent decrease change =
The relative decrease change × 100/100 =
(The relative decrease change × 100)/100 =
(The relative decrease change × 100)%
Calculate the relative percent decrease change:
(28,712.14 - 63,962.32)/|28,712.14| =
- 35,250.18/28,712.14 =
- 35,250.18 ÷ 28,712.14 =
- 35,250.18 ÷ 28,712.14 × 100/100 =
(- 35,250.18 × 100 ÷ 28,712.14)/100 =
(- 3,525,018 ÷ 28,712.14)/100 ≈
- 122.770995126103/100 =
- 122.770995126103% ≈
- 122.77%
(Rounded off to max. 2 decimal places)
The relative percent decrease change
from the original, initial value 28,712.14 to the final, end value 63,962.32:
Rounded off to max. 12 decimal places ≈ - 122.770995126103%
Rounded off to max. 2 decimal places ≈ - 122.77%
The absolute (actual) difference
28,712.14 - 63,962.32 = - 35,250.18
By what percentage has 28,712.14 decreased?
Answer: By ≈ - 122.77%
By what percentage is 63,962.32 smaller than 28,712.14?
Answer: By ≈ - 122.77%
The relative percent decrease change is negative,
so in this case we really have a relative percent increase instead
(the value goes up).