49.25% is the change from 664 to 991
Calculation steps:
[( 991 - 664 ) ÷ 664] x 100 = 49.25%
Formula
Percentage change = [(991 - 664) / 664] x 100
Subtract the new number by the original number
991 - 664 = 327
327 ÷ 664 = 0.4924698795180723
0.4924698795180723 x 100 = 49.25%