21400% is the change from 1 to 215
Calculation steps:
[( 215 - 1 ) ÷ 1] x 100 = 21400%
Formula
Percentage change = [(215 - 1) / 1] x 100
Subtract the new number by the original number
215 - 1 = 214
214 ÷ 1 = 214
214 x 100 = 21400%
Example