147.75% is the change from 400 to 991
Calculation steps:
[( 991 - 400 ) ÷ 400] x 100 = 147.75%
Formula
Percentage change = [(991 - 400) / 400] x 100
Subtract the new number by the original number
991 - 400 = 591
591 ÷ 400 = 1.4775
1.4775 x 100 = 147.75%