279.07% is the change from 215 to 815
Calculation steps:
[( 815 - 215 ) ÷ 215] x 100 = 279.07%
Formula
Percentage change = [(815 - 215) / 215] x 100
Subtract the new number by the original number
815 - 215 = 600
600 ÷ 215 = 2.7906976744186047
2.7906976744186047 x 100 = 279.07%