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 = 103.46, v2 = - 14.6.
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: - 72.
- Choose a random positive number for the end value: 91.
Formula and calculation:
(v1 - v2) / v1 =
(- 72 - 91) / - 72 =
-163 / - 72 ≈
2.263888888889 ≈
2.26
Although the absolute difference is negative: -163, the relative decrease change is positive: 2.26. 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:
(103.46 - (- 14.6))/|103.46| =
(103.46 + 14.6)/|103.46| =
118.06/103.46 =
118.06 ÷ 103.46 =
118.06 ÷ 103.46 × 100/100 =
(118.06 × 100 ÷ 103.46)/100 =
(11,806 ÷ 103.46)/100 ≈
114.11173400348/100 =
114.11173400348% ≈
114.11%
(Rounded off to max. 2 decimal places)
The relative percent decrease change
from the original, initial value 103.46 to the final, end value - 14.6:
Rounded off to max. 12 decimal places ≈ 114.11173400348%
Rounded off to max. 2 decimal places ≈ 114.11%
The absolute (actual) difference
103.46 + 14.6 = 118.06
By what percentage has 103.46 decreased?
Answer: By ≈ 114.11%
By what percentage is - 14.6 smaller than 103.46?
Answer: By ≈ 114.11%
The relative percent decrease change is positive,
so we really have a relative percent decrease
(the value goes down).