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 = 852, v2 = 738.7.
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: - 77.
- Choose a random positive number for the end value: 54.
Formula and calculation:
(v1 - v2) / v1 =
(- 77 - 54) / - 77 =
-131 / - 77 ≈
1.701298701299 ≈
1.7
Although the absolute difference is negative: -131, the relative decrease change is positive: 1.7. 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:
(852 - 738.7)/|852| =
113.3/852 =
113.3 ÷ 852 =
113.3 ÷ 852 × 100/100 =
(113.3 × 100 ÷ 852)/100 =
(11,330 ÷ 852)/100 ≈
13.298122065728/100 =
13.298122065728% ≈
13.3%
(Rounded off to max. 2 decimal places)
The relative percent decrease change
from the original, initial value 852 to the final, end value 738.7:
Rounded off to max. 12 decimal places ≈ 13.298122065728%
Rounded off to max. 2 decimal places ≈ 13.3%
The absolute (actual) difference
852 - 738.7 = 113.3
By what percentage has 852 decreased?
Answer: By ≈ 13.3%
By what percentage is 738.7 smaller than 852?
Answer: By ≈ 13.3%
The relative percent decrease change is positive,
so we really have a relative percent decrease
(the value goes down).