Suppose you want to retire in $20$ years with enough saved to earn $$50$K per year for $25$ years. Presume that you have not saved anything $[$OR have saved $$100$K$]$ towards retirement yet. Your plan is to make equal contributions over the next $20$ years to a retirement account that will earn $10$ percent per year.

List your variables and report back how much you have to have saved in FV terms, as well as how much you'll need to save in each of the next $10$ years.