1285.71% is the change from 21 to 291
Calculation steps:
[( 291 - 21 ) ÷ 21] x 100 = 1285.71%
Formula
Percentage change = [(291 - 21) / 21] x 100
Subtract the new number by the original number
291 - 21 = 270
270 ÷ 21 = 12.857142857142858
12.857142857142858 x 100 = 1285.71%