167.87% is the change from 305 to 817
Calculation steps:
[( 817 - 305 ) ÷ 305] x 100 = 167.87%
Formula
Percentage change = [(817 - 305) / 305] x 100
Subtract the new number by the original number
817 - 305 = 512
512 ÷ 305 = 1.678688524590164
1.678688524590164 x 100 = 167.87%