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 = 1,060,054, v2 = 938,136.3.
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: - 71.
- Choose a random positive number for the end value: 16.
Formula and calculation:
(v1 - v2) / v1 =
(- 71 - 16) / - 71 =
-87 / - 71 =
1.225352112676 ≈
1.23
Although the absolute difference is negative: -87, the relative decrease change is positive: 1.23. 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:
(1,060,054 - 938,136.3)/|1,060,054| =
121,917.7/1,060,054 =
121,917.7 ÷ 1,060,054 =
121,917.7 ÷ 1,060,054 × 100/100 =
(121,917.7 × 100 ÷ 1,060,054)/100 =
(12,191,770 ÷ 1,060,054)/100 ≈
11.501083907046/100 =
11.501083907046% ≈
11.5%
(Rounded off to max. 2 decimal places)
The relative percent decrease change
from the original, initial value 1,060,054 to the final, end value 938,136.3:
Rounded off to max. 12 decimal places ≈ 11.501083907046%
Rounded off to max. 2 decimal places ≈ 11.5%
The absolute (actual) difference
1,060,054 - 938,136.3 = 121,917.7
By what percentage has 1,060,054 decreased?
Answer: By ≈ 11.5%
By what percentage is 938,136.3 smaller than 1,060,054?
Answer: By ≈ 11.5%
The relative percent decrease change is positive,
so we really have a relative percent decrease
(the value goes down).