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: - 31.
- Choose a random positive number for the end value: 15.
Formula and calculation:
(v1 - v2) / v1 =
(- 31 - 15) / - 31 =
-46 / - 31 ≈
1.483870967742 ≈
1.48
Although the absolute difference is negative: -46, the relative decrease change is positive: 1.48. 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:
(7,514,151,274 - 8,531,053,983.9)/|7,514,151,274| =
- 1,016,902,709.9/7,514,151,274 =
- 1,016,902,709.9 ÷ 7,514,151,274 =
- 1,016,902,709.9 ÷ 7,514,151,274 × 100/100 =
(- 1,016,902,709.9 × 100 ÷ 7,514,151,274)/100 =
(- 101,690,270,990 ÷ 7,514,151,274)/100 ≈
- 13.533167923018/100 =
- 13.533167923018% ≈
- 13.53%
(Rounded off to max. 2 decimal places)
The relative percent decrease change
from the original, initial value 7,514,151,274 to the final, end value 8,531,053,983.9:
Rounded off to max. 12 decimal places ≈ - 13.533167923018%
Rounded off to max. 2 decimal places ≈ - 13.53%
The absolute (actual) difference
7,514,151,274 - 8,531,053,983.9 = - 1,016,902,709.9
By what percentage has 7,514,151,274 decreased?
Answer: By ≈ - 13.53%
By what percentage is 8,531,053,983.9 smaller than 7,514,151,274?
Answer: By ≈ - 13.53%
The relative percent decrease change is negative,
so in this case we really have a relative percent increase instead
(the value goes up).