177.35% is the change from 309 to 857
Calculation steps:
[( 857 - 309 ) ÷ 309] x 100 = 177.35%
Formula
Percentage change = [(857 - 309) / 309] x 100
Subtract the new number by the original number
857 - 309 = 548
548 ÷ 309 = 1.773462783171521
1.773462783171521 x 100 = 177.35%