85.8% is the change from 331 to 615
Calculation steps:
[( 615 - 331 ) ÷ 331] x 100 = 85.8%
Formula
Percentage change = [(615 - 331) / 331] x 100
Subtract the new number by the original number
615 - 331 = 284
284 ÷ 331 = 0.8580060422960725
0.8580060422960725 x 100 = 85.8%