1257.14% is the change from 21 to 285
Calculation steps:
[( 285 - 21 ) ÷ 21] x 100 = 1257.14%
Formula
Percentage change = [(285 - 21) / 21] x 100
Subtract the new number by the original number
285 - 21 = 264
264 ÷ 21 = 12.571428571428571
12.571428571428571 x 100 = 1257.14%