85.71% is the change from 42 to 78
Calculation steps:
[( 78 - 42 ) ÷ 42] x 100 = 85.71%
Formula
Percentage change = [(78 - 42) / 42] x 100
Subtract the new number by the original number
78 - 42 = 36
36 ÷ 42 = 0.8571428571428571
0.8571428571428571 x 100 = 85.71%