627.5% is the change from 40 to 291
Calculation steps:
[( 291 - 40 ) ÷ 40] x 100 = 627.5%
Formula
Percentage change = [(291 - 40) / 40] x 100
Subtract the new number by the original number
291 - 40 = 251
251 ÷ 40 = 6.275
6.275 x 100 = 627.5%
Example