-67.38% is the change from 840 to 274
Calculation steps:
[( 274 - 840 ) ÷ 840] x 100 = -67.38%
Formula
Percentage change = [(274 - 840) / 840] x 100
Subtract the new number by the original number
274 - 840 = -566
-566 ÷ 840 = -0.6738095238095239
-0.6738095238095239 x 100 = -67.38%