-77.21% is the change from 215 to 49
Calculation steps:
[( 49 - 215 ) ÷ 215] x 100 = -77.21%
Formula
Percentage change = [(49 - 215) / 215] x 100
Subtract the new number by the original number
49 - 215 = -166
-166 ÷ 215 = -0.772093023255814
-0.772093023255814 x 100 = -77.21%