78.14% is the change from 517 to 921
Calculation steps:
[( 921 - 517 ) ÷ 517] x 100 = 78.14%
Formula
Percentage change = [(921 - 517) / 517] x 100
Subtract the new number by the original number
921 - 517 = 404
404 ÷ 517 = 0.781431334622824
0.781431334622824 x 100 = 78.14%