64.61% is the change from 308 to 507
Calculation steps:
[( 507 - 308 ) ÷ 308] x 100 = 64.61%
Formula
Percentage change = [(507 - 308) / 308] x 100
Subtract the new number by the original number
507 - 308 = 199
199 ÷ 308 = 0.6461038961038961
0.6461038961038961 x 100 = 64.61%