143.75% is the change from 320 to 780
Calculation steps:
[( 780 - 320 ) ÷ 320] x 100 = 143.75%
Formula
Percentage change = [(780 - 320) / 320] x 100
Subtract the new number by the original number
780 - 320 = 460
460 ÷ 320 = 1.4375
1.4375 x 100 = 143.75%