1440% is the change from 50 to 770
Calculation steps:
[( 770 - 50 ) ÷ 50] x 100 = 1440%
Formula
Percentage change = [(770 - 50) / 50] x 100
Subtract the new number by the original number
770 - 50 = 720
720 ÷ 50 = 14.4
14.4 x 100 = 1440%
Example