867.5% is the change from 40 to 387
Calculation steps:
[( 387 - 40 ) ÷ 40] x 100 = 867.5%
Formula
Percentage change = [(387 - 40) / 40] x 100
Subtract the new number by the original number
387 - 40 = 347
347 ÷ 40 = 8.675
8.675 x 100 = 867.5%
Example