-16.13% is the change from 310 to 260
Calculation steps:
[( 260 - 310 ) ÷ 310] x 100 = -16.13%
Formula
Percentage change = [(260 - 310) / 310] x 100
Subtract the new number by the original number
260 - 310 = -50
-50 ÷ 310 = -0.16129032258064516
-0.16129032258064516 x 100 = -16.13%