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 = 7,589, v2 = 7,277.8.
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: - 44.
- Choose a random positive number for the end value: 77.
Formula and calculation:
(v1 - v2) / v1 =
(- 44 - 77) / - 44 =
-121 / - 44 =
2.75
Although the absolute difference is negative: -121, the relative decrease change is positive: 2.75. 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:
(7,589 - 7,277.8)/|7,589| =
311.2/7,589 =
311.2 ÷ 7,589 =
311.2 ÷ 7,589 × 100/100 =
(311.2 × 100 ÷ 7,589)/100 =
(31,120 ÷ 7,589)/100 ≈
4.1006720253/100 =
4.1006720253% ≈
4.1%
(Rounded off to max. 2 decimal places)
The relative percent decrease change
from the original, initial value 7,589 to the final, end value 7,277.8:
Rounded off to max. 12 decimal places ≈ 4.1006720253%
Rounded off to max. 2 decimal places ≈ 4.1%
The absolute (actual) difference
7,589 - 7,277.8 = 311.2
By what percentage has 7,589 decreased?
Answer: By ≈ 4.1%
By what percentage is 7,277.8 smaller than 7,589?
Answer: By ≈ 4.1%
The relative percent decrease change is positive,
so we really have a relative percent decrease
(the value goes down).