138.11% is the change from 391 to 931
Calculation steps:
[( 931 - 391 ) ÷ 391] x 100 = 138.11%
Formula
Percentage change = [(931 - 391) / 391] x 100
Subtract the new number by the original number
931 - 391 = 540
540 ÷ 391 = 1.381074168797954
1.381074168797954 x 100 = 138.11%