-86.73% is the change from 98 to 13
Calculation steps:
[( 13 - 98 ) ÷ 98] x 100 = -86.73%
Formula
Percentage change = [(13 - 98) / 98] x 100
Subtract the new number by the original number
13 - 98 = -85
-85 ÷ 98 = -0.8673469387755102
-0.8673469387755102 x 100 = -86.73%