1
The percentage change from old value (Vold) to new value (Vnew) is equal to the old and new values difference divided by the old value times 100%:
percentage change = (Vnew - Vold) / Vold × 100%
Price percentage increase from old value of $1000 to new value of $1200 is caluclated by:
percentage change = ($1200 - $1000) / $1000 × 100%
= 0.2 × 100% = 20%
Price percentage decrease from old value of $1000 to new value of $800 is caluclated by:
percentage change = ($800 - $1000) / $1000 × 100%
= -0.2 × 100% = -20%