308.1% is the change from 210 to 857
Calculation steps:
[( 857 - 210 ) ÷ 210] x 100 = 308.1%
Formula
Percentage change = [(857 - 210) / 210] x 100
Subtract the new number by the original number
857 - 210 = 647
647 ÷ 210 = 3.080952380952381
3.080952380952381 x 100 = 308.1%