325.93% is the change from 81 to 345
Calculation steps:
[( 345 - 81 ) ÷ 81] x 100 = 325.93%
Formula
Percentage change = [(345 - 81) / 81] x 100
Subtract the new number by the original number
345 - 81 = 264
264 ÷ 81 = 3.259259259259259
3.259259259259259 x 100 = 325.93%