257.21% is the change from 215 to 768
Calculation steps:
[( 768 - 215 ) ÷ 215] x 100 = 257.21%
Formula
Percentage change = [(768 - 215) / 215] x 100
Subtract the new number by the original number
768 - 215 = 553
553 ÷ 215 = 2.572093023255814
2.572093023255814 x 100 = 257.21%