166.35% is the change from 312 to 831
Calculation steps:
[( 831 - 312 ) ÷ 312] x 100 = 166.35%
Formula
Percentage change = [(831 - 312) / 312] x 100
Subtract the new number by the original number
831 - 312 = 519
519 ÷ 312 = 1.6634615384615385
1.6634615384615385 x 100 = 166.35%