256.32% is the change from 87 to 310
Calculation steps:
[( 310 - 87 ) ÷ 87] x 100 = 256.32%
Formula
Percentage change = [(310 - 87) / 87] x 100
Subtract the new number by the original number
310 - 87 = 223
223 ÷ 87 = 2.5632183908045976
2.5632183908045976 x 100 = 256.32%