49.92% is the change from 661 to 991
Calculation steps:
[( 991 - 661 ) ÷ 661] x 100 = 49.92%
Formula
Percentage change = [(991 - 661) / 661] x 100
Subtract the new number by the original number
991 - 661 = 330
330 ÷ 661 = 0.49924357034795763
0.49924357034795763 x 100 = 49.92%