15. Ed's daughter, Gladys, transferred the ownership of her house to Ed 7 years ago as a gift. Gladys originally paid $50,000 for the house 15 years earlier. When she gifted the house to Ed, it was valued at $75,000. Ed died this year and left everything he owned to Gladys, including the house she originally gifted to him. At Ed's death in 2018, the house had a fair market value of $100,000. Gladys sold the house at the end of the same year for $150,000. What is Gladys' gain on the sale of the house for income tax purposes?