4.8 11. Walter, a single taxpayer, purchased a limited partnership interest in a tax shelter in 1994. He also acquired a rental house in 2021, which he actively manages. During 2021, Walter's share of the partnership's losses was $30,000, and his rental house generated $20,000 in losses. Walter's modified adjusted gross income before passive losses is $120,000. a. Calculate the amount of Walter's allowable loss for rental house activities for 2021. $ b. Calculate the amount of Walter's allowable loss for the partnership activities for 2021. c. What may be done with the unused losses, if anything? $