1187.88% is the change from 66 to 850
Calculation steps:
[( 850 - 66 ) ÷ 66] x 100 = 1187.88%
Formula
Percentage change = [(850 - 66) / 66] x 100
Subtract the new number by the original number
850 - 66 = 784
784 ÷ 66 = 11.878787878787879
11.878787878787879 x 100 = 1187.88%