-67.75% is the change from 797 to 257
Calculation steps:
[( 257 - 797 ) ÷ 797] x 100 = -67.75%
Formula
Percentage change = [(257 - 797) / 797] x 100
Subtract the new number by the original number
257 - 797 = -540
-540 ÷ 797 = -0.6775407779171895
-0.6775407779171895 x 100 = -67.75%