19850% is the change from 2 to 399
Calculation steps:
[( 399 - 2 ) ÷ 2] x 100 = 19850%
Formula
Percentage change = [(399 - 2) / 2] x 100
Subtract the new number by the original number
399 - 2 = 397
397 ÷ 2 = 198.5
198.5 x 100 = 19850%
Example