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 = 0.014, v2 = - 13.4.
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: - 17.
- Choose a random positive number for the end value: 94.
Formula and calculation:
(v1 - v2) / v1 =
(- 17 - 94) / - 17 =
-111 / - 17 ≈
6.529411764706 ≈
6.53
Although the absolute difference is negative: -111, the relative decrease change is positive: 6.53. 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:
(0.014 - (- 13.4))/|0.014| =
(0.014 + 13.4)/|0.014| =
13.414/0.014 =
13.414 ÷ 0.014 =
13.414 ÷ 0.014 × 100/100 =
(13.414 × 100 ÷ 0.014)/100 =
(1,341.4 ÷ 0.014)/100 ≈
95,814.285714285714/100 =
95,814.285714285714% ≈
95,814.29%
(Rounded off to max. 2 decimal places)
The relative percent decrease change
from the original, initial value 0.014 to the final, end value - 13.4:
Rounded off to max. 12 decimal places ≈ 95,814.285714285714%
Rounded off to max. 2 decimal places ≈ 95,814.29%
The absolute (actual) difference
0.014 + 13.4 = 13.414 ≈ 13.41
By what percentage has 0.014 decreased?
Answer: By ≈ 95,814.29%
By what percentage is - 13.4 smaller than 0.014?
Answer: By ≈ 95,814.29%
The relative percent decrease change is positive,
so we really have a relative percent decrease
(the value goes down).