Which would you prefer $$10,000$ now; $$20,00010$ years from now; or $$30,00020$ years from now, assuming A$.6\%,$ B$.8\%,$ and C$.10\%.$ Please show your work and explain your answers. Hint $($You must get all lump sum payments into the same time period$)$ You will have a specific answer for A$,$ B$,$ and C$.$