66% is the change from 250 to 415
Calculation steps:
[( 415 - 250 ) ÷ 250] x 100 = 66%
Formula
Percentage change = [(415 - 250) / 250] x 100
Subtract the new number by the original number
415 - 250 = 165
165 ÷ 250 = 0.66
0.66 x 100 = 66%
Example