78.1% is the change from 420 to 748
Calculation steps:
[( 748 - 420 ) ÷ 420] x 100 = 78.1%
Formula
Percentage change = [(748 - 420) / 420] x 100
Subtract the new number by the original number
748 - 420 = 328
328 ÷ 420 = 0.780952380952381
0.780952380952381 x 100 = 78.1%