Oliver, who is single, received social security benefits of $8,440, dividend income of $12,600, and interest income of $2,110. Except as noted, those income items are reasonably consistent from year to year. At the end of 2022 , Oliver is considering selling stock that would result in an immediate gain of $10,220, a reduction in future dividends of $1,055, and an increase in future interest income of $1,555. Required: What amount of social security benefits is taxable to Oliver