215.19% is the change from 270 to 851
Calculation steps:
[( 851 - 270 ) ÷ 270] x 100 = 215.19%
Formula
Percentage change = [(851 - 270) / 270] x 100
Subtract the new number by the original number
851 - 270 = 581
581 ÷ 270 = 2.151851851851852
2.151851851851852 x 100 = 215.19%