-78.57% is the change from 238 to 51
Calculation steps:
[( 51 - 238 ) ÷ 238] x 100 = -78.57%
Formula
Percentage change = [(51 - 238) / 238] x 100
Subtract the new number by the original number
51 - 238 = -187
-187 ÷ 238 = -0.7857142857142857
-0.7857142857142857 x 100 = -78.57%