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 = 365, v2 = 114.1.
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: - 76.
- Choose a random positive number for the end value: 24.
Formula and calculation:
(v1 - v2) / v1 =
(- 76 - 24) / - 76 =
-100 / - 76 ≈
1.315789473684 ≈
1.32
Although the absolute difference is negative: -100, the relative decrease change is positive: 1.32. 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:
(365 - 114.1)/|365| =
250.9/365 =
250.9 ÷ 365 =
250.9 ÷ 365 × 100/100 =
(250.9 × 100 ÷ 365)/100 =
(25,090 ÷ 365)/100 ≈
68.739726027397/100 =
68.739726027397% ≈
68.74%
(Rounded off to max. 2 decimal places)
The relative percent decrease change
from the original, initial value 365 to the final, end value 114.1:
Rounded off to max. 12 decimal places ≈ 68.739726027397%
Rounded off to max. 2 decimal places ≈ 68.74%
The absolute (actual) difference
365 - 114.1 = 250.9
By what percentage has 365 decreased?
Answer: By ≈ 68.74%
By what percentage is 114.1 smaller than 365?
Answer: By ≈ 68.74%
The relative percent decrease change is positive,
so we really have a relative percent decrease
(the value goes down).