94.7% is the change from 509 to 991
Calculation steps:
[( 991 - 509 ) ÷ 509] x 100 = 94.7%
Formula
Percentage change = [(991 - 509) / 509] x 100
Subtract the new number by the original number
991 - 509 = 482
482 ÷ 509 = 0.9469548133595285
0.9469548133595285 x 100 = 94.7%