81.08% is the change from 518 to 938
Calculation steps:
[( 938 - 518 ) ÷ 518] x 100 = 81.08%
Formula
Percentage change = [(938 - 518) / 518] x 100
Subtract the new number by the original number
938 - 518 = 420
420 ÷ 518 = 0.8108108108108109
0.8108108108108109 x 100 = 81.08%