154.1% is the change from 390 to 991
Calculation steps:
[( 991 - 390 ) ÷ 390] x 100 = 154.1%
Formula
Percentage change = [(991 - 390) / 390] x 100
Subtract the new number by the original number
991 - 390 = 601
601 ÷ 390 = 1.541025641025641
1.541025641025641 x 100 = 154.1%