318% is the change from 50 to 209
Calculation steps:
[( 209 - 50 ) ÷ 50] x 100 = 318%
Formula
Percentage change = [(209 - 50) / 50] x 100
Subtract the new number by the original number
209 - 50 = 159
159 ÷ 50 = 3.18
3.18 x 100 = 318%
Example