27.47% is the change from 506 to 645
Calculation steps:
[( 645 - 506 ) ÷ 506] x 100 = 27.47%
Formula
Percentage change = [(645 - 506) / 506] x 100
Subtract the new number by the original number
645 - 506 = 139
139 ÷ 506 = 0.274703557312253
0.274703557312253 x 100 = 27.47%