Calcular percentage increase from initial (old) Valor to final (new) value:
Calcular final (new) Valor from initial (old) value and percentage increase:
The percentage increase/decrease from initial Valor (Vinitial) to final Valor (Vfinal) is equal to the initial and final values difference divided by the initial Valor times 100%:
Price percentage increase from initial Valor of $1000 to final value of $1200 is caluclated by:
Price percentage increase from initial Valor of $1000 to final value of $800 is caluclated by:
So
percentage decrease = 20%
The difference d is equal to the initial Valor Vinitial times the percentage increase/decrease p divided by 100:
The final Valor Vfinal is equal to the initial Valor Vinitial plus the difference d:
Vfinal = Vinitial + d