305.88% is the change from 85 to 345
Calculation steps:
[( 345 - 85 ) ÷ 85] x 100 = 305.88%
Formula
Percentage change = [(345 - 85) / 85] x 100
Subtract the new number by the original number
345 - 85 = 260
260 ÷ 85 = 3.0588235294117645
3.0588235294117645 x 100 = 305.88%