138.14% is the change from 215 to 512
Calculation steps:
[( 512 - 215 ) ÷ 215] x 100 = 138.14%
Formula
Percentage change = [(512 - 215) / 215] x 100
Subtract the new number by the original number
512 - 215 = 297
297 ÷ 215 = 1.3813953488372093
1.3813953488372093 x 100 = 138.14%