636.26% is the change from 91 to 670
Calculation steps:
[( 670 - 91 ) ÷ 91] x 100 = 636.26%
Formula
Percentage change = [(670 - 91) / 91] x 100
Subtract the new number by the original number
670 - 91 = 579
579 ÷ 91 = 6.362637362637362
6.362637362637362 x 100 = 636.26%