I Orbital distance increase during the white dwarf phase of the Sun

[Dreksler]

TL;DR Summary

Want to know as to how to calculate orbital distance of bodies in the Solar system during the white dwarf phase of the Sun.

Some estimates through calculating the sun mass loss and increase in mass loss say that the white dwarf phase of the Sun will have roughly about 50% the current mass of the Sun (not sure about it). Whatever the actual mass loss is going to be, assuming that the 50% mass loss is true, where would that approximately put the orbit of let's say Pluto, how much outward will it expand due to a lower gravitational pull from the Sun, and what is the calculation process?

 

[Keith_McClary]

You have an equation relating orbital speed to radius (derived from gravitational force = "centripetal force").
Then use conservation of angular momentum.