284.85% is the change from 66 to 254
Calculation steps:
[( 254 - 66 ) ÷ 66] x 100 = 284.85%
Formula
Percentage change = [(254 - 66) / 66] x 100
Subtract the new number by the original number
254 - 66 = 188
188 ÷ 66 = 2.8484848484848486
2.8484848484848486 x 100 = 284.85%