52.48% is the change from 505 to 770
Calculation steps:
[( 770 - 505 ) ÷ 505] x 100 = 52.48%
Formula
Percentage change = [(770 - 505) / 505] x 100
Subtract the new number by the original number
770 - 505 = 265
265 ÷ 505 = 0.5247524752475248
0.5247524752475248 x 100 = 52.48%