155.17% is the change from 261 to 666
Calculation steps:
[( 666 - 261 ) ÷ 261] x 100 = 155.17%
Formula
Percentage change = [(666 - 261) / 261] x 100
Subtract the new number by the original number
666 - 261 = 405
405 ÷ 261 = 1.5517241379310345
1.5517241379310345 x 100 = 155.17%