-80% is the change from 305 to 61
Calculation steps:
[( 61 - 305 ) ÷ 305] x 100 = -80%
Formula
Percentage change = [(61 - 305) / 305] x 100
Subtract the new number by the original number
61 - 305 = -244
-244 ÷ 305 = -0.8
-0.8 x 100 = -80%
Example