299.51% is the change from 204 to 815
Calculation steps:
[( 815 - 204 ) ÷ 204] x 100 = 299.51%
Formula
Percentage change = [(815 - 204) / 204] x 100
Subtract the new number by the original number
815 - 204 = 611
611 ÷ 204 = 2.9950980392156863
2.9950980392156863 x 100 = 299.51%