6.61% is the change from 620 to 661
Calculation steps:
[( 661 - 620 ) ÷ 620] x 100 = 6.61%
Formula
Percentage change = [(661 - 620) / 620] x 100
Subtract the new number by the original number
661 - 620 = 41
41 ÷ 620 = 0.06612903225806452
0.06612903225806452 x 100 = 6.61%