318.6% is the change from 215 to 900
Calculation steps:
[( 900 - 215 ) ÷ 215] x 100 = 318.6%
Formula
Percentage change = [(900 - 215) / 215] x 100
Subtract the new number by the original number
900 - 215 = 685
685 ÷ 215 = 3.186046511627907
3.186046511627907 x 100 = 318.6%