178.69% is the change from 305 to 850
Calculation steps:
[( 850 - 305 ) ÷ 305] x 100 = 178.69%
Formula
Percentage change = [(850 - 305) / 305] x 100
Subtract the new number by the original number
850 - 305 = 545
545 ÷ 305 = 1.7868852459016393
1.7868852459016393 x 100 = 178.69%