-80% is the change from 770 to 154
Calculation steps:
[( 154 - 770 ) ÷ 770] x 100 = -80%
Formula
Percentage change = [(154 - 770) / 770] x 100
Subtract the new number by the original number
154 - 770 = -616
-616 ÷ 770 = -0.8
-0.8 x 100 = -80%
Example