51.57% is the change from 508 to 770
Calculation steps:
[( 770 - 508 ) ÷ 508] x 100 = 51.57%
Formula
Percentage change = [(770 - 508) / 508] x 100
Subtract the new number by the original number
770 - 508 = 262
262 ÷ 508 = 0.515748031496063
0.515748031496063 x 100 = 51.57%