93.59% is the change from 421 to 815
Calculation steps:
[( 815 - 421 ) ÷ 421] x 100 = 93.59%
Formula
Percentage change = [(815 - 421) / 421] x 100
Subtract the new number by the original number
815 - 421 = 394
394 ÷ 421 = 0.9358669833729216
0.9358669833729216 x 100 = 93.59%