-90.64% is the change from 545 to 51
Calculation steps:
[( 51 - 545 ) ÷ 545] x 100 = -90.64%
Formula
Percentage change = [(51 - 545) / 545] x 100
Subtract the new number by the original number
51 - 545 = -494
-494 ÷ 545 = -0.9064220183486239
-0.9064220183486239 x 100 = -90.64%