302.84% is the change from 211 to 850
Calculation steps:
[( 850 - 211 ) ÷ 211] x 100 = 302.84%
Formula
Percentage change = [(850 - 211) / 211] x 100
Subtract the new number by the original number
850 - 211 = 639
639 ÷ 211 = 3.028436018957346
3.028436018957346 x 100 = 302.84%