John has 2 jobs in 2021. He earned the following: Job 1 Job 2 80,000 70,000 Salary Federal Withholding tax Social Security 15,000 10,000 4,960 4,340 Medicare 1.160 1,015 If John's 2021 federal income tax is calculated at $ 23,500, how much will John receive as a refund on his 2021 federal income tax return. Assume John has Job 1, but instead of Job 2, he earned $ 70,000 as a self-employed Carpenter. Calculate John's Self-employment tax