83.23% is the change from 155 to 284
Calculation steps:
[( 284 - 155 ) ÷ 155] x 100 = 83.23%
Formula
Percentage change = [(284 - 155) / 155] x 100
Subtract the new number by the original number
284 - 155 = 129
129 ÷ 155 = 0.832258064516129
0.832258064516129 x 100 = 83.23%