1252.38% is the change from 21 to 284
Calculation steps:
[( 284 - 21 ) ÷ 21] x 100 = 1252.38%
Formula
Percentage change = [(284 - 21) / 21] x 100
Subtract the new number by the original number
284 - 21 = 263
263 ÷ 21 = 12.523809523809524
12.523809523809524 x 100 = 1252.38%