2342.5% is the change from 40 to 977
Calculation steps:
[( 977 - 40 ) ÷ 40] x 100 = 2342.5%
Formula
Percentage change = [(977 - 40) / 40] x 100
Subtract the new number by the original number
977 - 40 = 937
937 ÷ 40 = 23.425
23.425 x 100 = 2342.5%
Example