please explain in each steps. Thank you

G and L form a limited partnership. L contributes $2,000, and G, who does not contribute cash, will use her immense brainpower to earn money for the partnership. The business deal is that L receives all cash distributions until L has received back the amount of her capital investment. Subsequent distributions will be split 80% to L and 20% to G. In Year 1, the partnership buys two parcels of land, Blackacre and Whiteacre, each for $1000. At year end, the partnership sells Blackacre for $1100 and distributes the entire proceeds of $100 to L. How should the $100 gain on Blackacre be allocated between L and G to be consistent with the business deal?