50.98% is the change from 510 to 770
Calculation steps:
[( 770 - 510 ) ÷ 510] x 100 = 50.98%
Formula
Percentage change = [(770 - 510) / 510] x 100
Subtract the new number by the original number
770 - 510 = 260
260 ÷ 510 = 0.5098039215686274
0.5098039215686274 x 100 = 50.98%