640% is the change from 10 to 74
Calculation steps:
[( 74 - 10 ) ÷ 10] x 100 = 640%
Formula
Percentage change = [(74 - 10) / 10] x 100
Subtract the new number by the original number
74 - 10 = 64
64 ÷ 10 = 6.4
6.4 x 100 = 640%
Example