4.6% is the change from 87 to 91
Calculation steps:
[( 91 - 87 ) ÷ 87] x 100 = 4.6%
Formula
Percentage change = [(91 - 87) / 87] x 100
Subtract the new number by the original number
91 - 87 = 4
4 ÷ 87 = 0.04597701149425287
0.04597701149425287 x 100 = 4.6%