309.57% is the change from 188 to 770
Calculation steps:
[( 770 - 188 ) ÷ 188] x 100 = 309.57%
Formula
Percentage change = [(770 - 188) / 188] x 100
Subtract the new number by the original number
770 - 188 = 582
582 ÷ 188 = 3.095744680851064
3.095744680851064 x 100 = 309.57%