78.15% is the change from 421 to 750
Calculation steps:
[( 750 - 421 ) ÷ 421] x 100 = 78.15%
Formula
Percentage change = [(750 - 421) / 421] x 100
Subtract the new number by the original number
750 - 421 = 329
329 ÷ 421 = 0.7814726840855107
0.7814726840855107 x 100 = 78.15%