6510% is the change from 10 to 661
Calculation steps:
[( 661 - 10 ) ÷ 10] x 100 = 6510%
Formula
Percentage change = [(661 - 10) / 10] x 100
Subtract the new number by the original number
661 - 10 = 651
651 ÷ 10 = 65.1
65.1 x 100 = 6510%
Example