How to reduce the percentage of thousand fraction

How to reduce the percentage of thousand fraction

Example: 3 / 1000 to percentage
3 (100)/1000 = (3/10) / 100 = (3/10) %
All fractions are multiplied by 100 to get percentage (%), including thousand fractions
x/y = [(x/y)(100)] / 100
= (x/y)(100) %