87.95% is the change from 166 to 312
Calculation steps:
[( 312 - 166 ) ÷ 166] x 100 = 87.95%
Formula
Percentage change = [(312 - 166) / 166] x 100
Subtract the new number by the original number
312 - 166 = 146
146 ÷ 166 = 0.8795180722891566
0.8795180722891566 x 100 = 87.95%