-33.76% is the change from 388 to 257
Calculation steps:
[( 257 - 388 ) ÷ 388] x 100 = -33.76%
Formula
Percentage change = [(257 - 388) / 388] x 100
Subtract the new number by the original number
257 - 388 = -131
-131 ÷ 388 = -0.33762886597938147
-0.33762886597938147 x 100 = -33.76%