312.35% is the change from 81 to 334
Calculation steps:
[( 334 - 81 ) ÷ 81] x 100 = 312.35%
Formula
Percentage change = [(334 - 81) / 81] x 100
Subtract the new number by the original number
334 - 81 = 253
253 ÷ 81 = 3.123456790123457
3.123456790123457 x 100 = 312.35%