947.5% is the change from 40 to 419
Calculation steps:
[( 419 - 40 ) ÷ 40] x 100 = 947.5%
Formula
Percentage change = [(419 - 40) / 40] x 100
Subtract the new number by the original number
419 - 40 = 379
379 ÷ 40 = 9.475
9.475 x 100 = 947.5%
Example