81.66% is the change from 507 to 921
Calculation steps:
[( 921 - 507 ) ÷ 507] x 100 = 81.66%
Formula
Percentage change = [(921 - 507) / 507] x 100
Subtract the new number by the original number
921 - 507 = 414
414 ÷ 507 = 0.8165680473372781
0.8165680473372781 x 100 = 81.66%