268.97% is the change from 87 to 321
Calculation steps:
[( 321 - 87 ) ÷ 87] x 100 = 268.97%
Formula
Percentage change = [(321 - 87) / 87] x 100
Subtract the new number by the original number
321 - 87 = 234
234 ÷ 87 = 2.689655172413793
2.689655172413793 x 100 = 268.97%