Figuring out taxable social security benefits.

Jon has $16,710 in taxable pension income, as well as $27,303 in social security benefits for the year 2018. What amount of his social security benefit is taxable on his federal income tax return?

I attempted to answer this on my own and found:

Taxable amount= one-half the difference between the adjusted base amount and the base amount of the tax payer.

Jon's base amount = $25,000

Adjusted base amount = the lessor of $34,000 and ($16,710 + (27,303/2) = $30,362

Jon's taxable social security benefit= ($30,362-25,000) / 2 = $2681