938.1% is the change from 21 to 218
Calculation steps:
[( 218 - 21 ) ÷ 21] x 100 = 938.1%
Formula
Percentage change = [(218 - 21) / 21] x 100
Subtract the new number by the original number
218 - 21 = 197
197 ÷ 21 = 9.380952380952381
9.380952380952381 x 100 = 938.1%