20 is 3.1% of 645
Calculation steps:
( 20 ÷ 645 ) x 100 = 3.1%
Formula
(20 ÷ 645) x 100 = 3.1%
20 ÷ 645 = 0.031007751937984496
Decimal to percent
0.031007751937984496 x 100 = 3.1%
Example