330% is the change from 50 to 215
Calculation steps:
[( 215 - 50 ) ÷ 50] x 100 = 330%
Formula
Percentage change = [(215 - 50) / 50] x 100
Subtract the new number by the original number
215 - 50 = 165
165 ÷ 50 = 3.3
3.3 x 100 = 330%
Example