278.79% is the change from 66 to 250
Calculation steps:
[( 250 - 66 ) ÷ 66] x 100 = 278.79%
Formula
Percentage change = [(250 - 66) / 66] x 100
Subtract the new number by the original number
250 - 66 = 184
184 ÷ 66 = 2.787878787878788
2.787878787878788 x 100 = 278.79%