48.84% is the change from 215 to 320
Calculation steps:
[( 320 - 215 ) ÷ 215] x 100 = 48.84%
Formula
Percentage change = [(320 - 215) / 215] x 100
Subtract the new number by the original number
320 - 215 = 105
105 ÷ 215 = 0.4883720930232558
0.4883720930232558 x 100 = 48.84%