-79.01% is the change from 243 to 51
Calculation steps:
[( 51 - 243 ) ÷ 243] x 100 = -79.01%
Formula
Percentage change = [(51 - 243) / 243] x 100
Subtract the new number by the original number
51 - 243 = -192
-192 ÷ 243 = -0.7901234567901234
-0.7901234567901234 x 100 = -79.01%