81.95% is the change from 421 to 766
Calculation steps:
[( 766 - 421 ) ÷ 421] x 100 = 81.95%
Formula
Percentage change = [(766 - 421) / 421] x 100
Subtract the new number by the original number
766 - 421 = 345
345 ÷ 421 = 0.8194774346793349
0.8194774346793349 x 100 = 81.95%