Question 70 of 75 Donald (66) and Leah (62) file married filing joint. Their income for 2018 is: Donald-$13,876 -Social Security Benefits Leah-$15,000 -Wages Joint-$510-Taxable interest income How much of Donald's social security income may be taxable? $o. O $6,938. $13,876. O $22,448. Mark for follow up auestion 68 of 75 7, Bill, a single taxpayer, purchased a home for $187,000. Later that year, he added a new room at a cost of June 2017 $28,400. In May 2018, he sold the house for $473,000. The home served as his primary reside owned it. Bill's taxable gain on the sale is so O $7,600 $257,600 $286,000 Mark for follow up