-85.22% is the change from 345 to 51
Calculation steps:
[( 51 - 345 ) ÷ 345] x 100 = -85.22%
Formula
Percentage change = [(51 - 345) / 345] x 100
Subtract the new number by the original number
51 - 345 = -294
-294 ÷ 345 = -0.8521739130434782
-0.8521739130434782 x 100 = -85.22%