-47.16% is the change from 511 to 270
Calculation steps:
[( 270 - 511 ) ÷ 511] x 100 = -47.16%
Formula
Percentage change = [(270 - 511) / 511] x 100
Subtract the new number by the original number
270 - 511 = -241
-241 ÷ 511 = -0.47162426614481406
-0.47162426614481406 x 100 = -47.16%