-36.86% is the change from 491 to 310
Calculation steps:
[( 310 - 491 ) ÷ 491] x 100 = -36.86%
Formula
Percentage change = [(310 - 491) / 491] x 100
Subtract the new number by the original number
310 - 491 = -181
-181 ÷ 491 = -0.36863543788187375
-0.36863543788187375 x 100 = -36.86%