284.91% is the change from 212 to 816
Calculation steps:
[( 816 - 212 ) ÷ 212] x 100 = 284.91%
Formula
Percentage change = [(816 - 212) / 212] x 100
Subtract the new number by the original number
816 - 212 = 604
604 ÷ 212 = 2.849056603773585
2.849056603773585 x 100 = 284.91%