-84.96% is the change from 339 to 51
Calculation steps:
[( 51 - 339 ) ÷ 339] x 100 = -84.96%
Formula
Percentage change = [(51 - 339) / 339] x 100
Subtract the new number by the original number
51 - 339 = -288
-288 ÷ 339 = -0.8495575221238938
-0.8495575221238938 x 100 = -84.96%