-34.38% is the change from 768 to 504
Calculation steps:
[( 504 - 768 ) ÷ 768] x 100 = -34.38%
Formula
Percentage change = [(504 - 768) / 768] x 100
Subtract the new number by the original number
504 - 768 = -264
-264 ÷ 768 = -0.34375
-0.34375 x 100 = -34.38%