-38.54% is the change from 506 to 311
Calculation steps:
[( 311 - 506 ) ÷ 506] x 100 = -38.54%
Formula
Percentage change = [(311 - 506) / 506] x 100
Subtract the new number by the original number
311 - 506 = -195
-195 ÷ 506 = -0.38537549407114624
-0.38537549407114624 x 100 = -38.54%