-33.46% is the change from 768 to 511
Calculation steps:
[( 511 - 768 ) ÷ 768] x 100 = -33.46%
Formula
Percentage change = [(511 - 768) / 768] x 100
Subtract the new number by the original number
511 - 768 = -257
-257 ÷ 768 = -0.3346354166666667
-0.3346354166666667 x 100 = -33.46%