-86.02% is the change from 93 to 13
Calculation steps:
[( 13 - 93 ) ÷ 93] x 100 = -86.02%
Formula
Percentage change = [(13 - 93) / 93] x 100
Subtract the new number by the original number
13 - 93 = -80
-80 ÷ 93 = -0.8602150537634409
-0.8602150537634409 x 100 = -86.02%