-48.18% is the change from 521 to 270
Calculation steps:
[( 270 - 521 ) ÷ 521] x 100 = -48.18%
Formula
Percentage change = [(270 - 521) / 521] x 100
Subtract the new number by the original number
270 - 521 = -251
-251 ÷ 521 = -0.4817658349328215
-0.4817658349328215 x 100 = -48.18%