510% is the change from 50 to 305
Calculation steps:
[( 305 - 50 ) ÷ 50] x 100 = 510%
Formula
Percentage change = [(305 - 50) / 50] x 100
Subtract the new number by the original number
305 - 50 = 255
255 ÷ 50 = 5.1
5.1 x 100 = 510%
Example