81.87% is the change from 331 to 602
Calculation steps:
[( 602 - 331 ) ÷ 331] x 100 = 81.87%
Formula
Percentage change = [(602 - 331) / 331] x 100
Subtract the new number by the original number
602 - 331 = 271
271 ÷ 331 = 0.8187311178247734
0.8187311178247734 x 100 = 81.87%