-34.46% is the change from 505 to 331
Calculation steps:
[( 331 - 505 ) ÷ 505] x 100 = -34.46%
Formula
Percentage change = [(331 - 505) / 505] x 100
Subtract the new number by the original number
331 - 505 = -174
-174 ÷ 505 = -0.3445544554455445
-0.3445544554455445 x 100 = -34.46%