-68.73% is the change from 502 to 157
Calculation steps:
[( 157 - 502 ) ÷ 502] x 100 = -68.73%
Formula
Percentage change = [(157 - 502) / 502] x 100
Subtract the new number by the original number
157 - 502 = -345
-345 ÷ 502 = -0.6872509960159362
-0.6872509960159362 x 100 = -68.73%