402% is the change from 50 to 251
Calculation steps:
[( 251 - 50 ) ÷ 50] x 100 = 402%
Formula
Percentage change = [(251 - 50) / 50] x 100
Subtract the new number by the original number
251 - 50 = 201
201 ÷ 50 = 4.02
4.02 x 100 = 402%
Example