3.57% is the change from 84 to 87
Calculation steps:
[( 87 - 84 ) ÷ 84] x 100 = 3.57%
Formula
Percentage change = [(87 - 84) / 84] x 100
Subtract the new number by the original number
87 - 84 = 3
3 ÷ 84 = 0.03571428571428571
0.03571428571428571 x 100 = 3.57%