-56.5% is the change from 600 to 261
Calculation steps:
[( 261 - 600 ) ÷ 600] x 100 = -56.5%
Formula
Percentage change = [(261 - 600) / 600] x 100
Subtract the new number by the original number
261 - 600 = -339
-339 ÷ 600 = -0.565
-0.565 x 100 = -56.5%