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 = 114, v2 = 93.6.
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: - 73.
- Choose a random positive number for the end value: 94.
Formula and calculation:
(v1 - v2) / v1 =
(- 73 - 94) / - 73 =
-167 / - 73 ≈
2.287671232877 ≈
2.29
Although the absolute difference is negative: -167, the relative decrease change is positive: 2.29. 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:
(114 - 93.6)/|114| =
20.4/114 =
20.4 ÷ 114 =
20.4 ÷ 114 × 100/100 =
(20.4 × 100 ÷ 114)/100 =
(2,040 ÷ 114)/100 ≈
17.894736842105/100 =
17.894736842105% ≈
17.89%
(Rounded off to max. 2 decimal places)
The relative percent decrease change
from the original, initial value 114 to the final, end value 93.6:
Rounded off to max. 12 decimal places ≈ 17.894736842105%
Rounded off to max. 2 decimal places ≈ 17.89%
The absolute (actual) difference
114 - 93.6 = 20.4
By what percentage has 114 decreased?
Answer: By ≈ 17.89%
By what percentage is 93.6 smaller than 114?
Answer: By ≈ 17.89%
The relative percent decrease change is positive,
so we really have a relative percent decrease
(the value goes down).