-96.47% is the change from 340 to 12
Calculation steps:
[( 12 - 340 ) ÷ 340] x 100 = -96.47%
Formula
Percentage change = [(12 - 340) / 340] x 100
Subtract the new number by the original number
12 - 340 = -328
-328 ÷ 340 = -0.9647058823529412
-0.9647058823529412 x 100 = -96.47%