310.26% is the change from 78 to 320
Calculation steps:
[( 320 - 78 ) ÷ 78] x 100 = 310.26%
Formula
Percentage change = [(320 - 78) / 78] x 100
Subtract the new number by the original number
320 - 78 = 242
242 ÷ 78 = 3.1025641025641026
3.1025641025641026 x 100 = 310.26%