54.6% is the change from 641 to 991
Calculation steps:
[( 991 - 641 ) ÷ 641] x 100 = 54.6%
Formula
Percentage change = [(991 - 641) / 641] x 100
Subtract the new number by the original number
991 - 641 = 350
350 ÷ 641 = 0.5460218408736349
0.5460218408736349 x 100 = 54.6%