-66.54% is the change from 768 to 257
Calculation steps:
[( 257 - 768 ) ÷ 768] x 100 = -66.54%
Formula
Percentage change = [(257 - 768) / 768] x 100
Subtract the new number by the original number
257 - 768 = -511
-511 ÷ 768 = -0.6653645833333334
-0.6653645833333334 x 100 = -66.54%