90.02% is the change from 421 to 800
Calculation steps:
[( 800 - 421 ) ÷ 421] x 100 = 90.02%
Formula
Percentage change = [(800 - 421) / 421] x 100
Subtract the new number by the original number
800 - 421 = 379
379 ÷ 421 = 0.9002375296912114
0.9002375296912114 x 100 = 90.02%