Answer:
$100,000
Step-by-step explanation:
Money they made from the sale = Price they sold the house - Original cost of the house.
Money they made from sell = $500000 - $150000 = $350000
Therefore they made $350000 from the sale.
Under IRC section 121, a taxpayer must own and occupy the property as a principal residence for two of the five years immediately before the sale to gain an exclusion of $250,000 ($500,000 for certain married taxpayers). But Sissy is not eligible for the exclusion, so they are not considered as married taxpayers, therefore they have an exclusion of $250000.
The gain payable = $350000 - $250000 = $100000