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 = 49,631, v2 = 34,062.4.
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: - 33.
- Choose a random positive number for the end value: 12.
Formula and calculation:
(v1 - v2) / v1 =
(- 33 - 12) / - 33 =
-45 / - 33 ≈
1.363636363636 ≈
1.36
Although the absolute difference is negative: -45, the relative decrease change is positive: 1.36. 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:
(49,631 - 34,062.4)/|49,631| =
15,568.6/49,631 =
15,568.6 ÷ 49,631 =
15,568.6 ÷ 49,631 × 100/100 =
(15,568.6 × 100 ÷ 49,631)/100 =
(1,556,860 ÷ 49,631)/100 ≈
31.368701013479/100 =
31.368701013479% ≈
31.37%
(Rounded off to max. 2 decimal places)
The relative percent decrease change
from the original, initial value 49,631 to the final, end value 34,062.4:
Rounded off to max. 12 decimal places ≈ 31.368701013479%
Rounded off to max. 2 decimal places ≈ 31.37%
The absolute (actual) difference
49,631 - 34,062.4 = 15,568.6
By what percentage has 49,631 decreased?
Answer: By ≈ 31.37%
By what percentage is 34,062.4 smaller than 49,631?
Answer: By ≈ 31.37%
The relative percent decrease change is positive,
so we really have a relative percent decrease
(the value goes down).