87.31% is the change from 331 to 620
Calculation steps:
[( 620 - 331 ) ÷ 331] x 100 = 87.31%
Formula
Percentage change = [(620 - 331) / 331] x 100
Subtract the new number by the original number
620 - 331 = 289
289 ÷ 331 = 0.8731117824773413
0.8731117824773413 x 100 = 87.31%