84.09% is the change from 421 to 775
Calculation steps:
[( 775 - 421 ) ÷ 421] x 100 = 84.09%
Formula
Percentage change = [(775 - 421) / 421] x 100
Subtract the new number by the original number
775 - 421 = 354
354 ÷ 421 = 0.8408551068883611
0.8408551068883611 x 100 = 84.09%