66.5% is the change from 397 to 661
Calculation steps:
[( 661 - 397 ) ÷ 397] x 100 = 66.5%
Formula
Percentage change = [(661 - 397) / 397] x 100
Subtract the new number by the original number
661 - 397 = 264
264 ÷ 397 = 0.6649874055415617
0.6649874055415617 x 100 = 66.5%