-50.25% is the change from 611 to 304
Calculation steps:
[( 304 - 611 ) ÷ 611] x 100 = -50.25%
Formula
Percentage change = [(304 - 611) / 611] x 100
Subtract the new number by the original number
304 - 611 = -307
-307 ÷ 611 = -0.502454991816694
-0.502454991816694 x 100 = -50.25%