-45.15% is the change from 392 to 215
Calculation steps:
[( 215 - 392 ) ÷ 392] x 100 = -45.15%
Formula
Percentage change = [(215 - 392) / 392] x 100
Subtract the new number by the original number
215 - 392 = -177
-177 ÷ 392 = -0.45153061224489793
-0.45153061224489793 x 100 = -45.15%