256.28% is the change from 215 to 766
Calculation steps:
[( 766 - 215 ) ÷ 215] x 100 = 256.28%
Formula
Percentage change = [(766 - 215) / 215] x 100
Subtract the new number by the original number
766 - 215 = 551
551 ÷ 215 = 2.562790697674419
2.562790697674419 x 100 = 256.28%