-77.47% is the change from 830 to 187
Calculation steps:
[( 187 - 830 ) ÷ 830] x 100 = -77.47%
Formula
Percentage change = [(187 - 830) / 830] x 100
Subtract the new number by the original number
187 - 830 = -643
-643 ÷ 830 = -0.7746987951807229
-0.7746987951807229 x 100 = -77.47%