167.21% is the change from 305 to 815
Calculation steps:
[( 815 - 305 ) ÷ 305] x 100 = 167.21%
Formula
Percentage change = [(815 - 305) / 305] x 100
Subtract the new number by the original number
815 - 305 = 510
510 ÷ 305 = 1.6721311475409837
1.6721311475409837 x 100 = 167.21%