509.8% is the change from 51 to 311
Calculation steps:
[( 311 - 51 ) ÷ 51] x 100 = 509.8%
Formula
Percentage change = [(311 - 51) / 51] x 100
Subtract the new number by the original number
311 - 51 = 260
260 ÷ 51 = 5.098039215686274
5.098039215686274 x 100 = 509.8%