83.1% is the change from 284 to 520
Calculation steps:
[( 520 - 284 ) ÷ 284] x 100 = 83.1%
Formula
Percentage change = [(520 - 284) / 284] x 100
Subtract the new number by the original number
520 - 284 = 236
236 ÷ 284 = 0.8309859154929577
0.8309859154929577 x 100 = 83.1%