The total Social Security and Medicare tax that Joey would pay in a year would be $3,175.25.
Social Security taxes apply only to the first $142,800 of income in a year. If Joey's income is $20,750 per year, and assuming that all of his income is subject to both Social Security and Medicare taxes, we can calculate the taxes as follows:
Social Security tax: $20,750 * 12.4%
= $2,573
Medicare tax: $20,750 * 2.9%
= $602.25
Therefore, the total Social Security and Medicare tax that Joey would pay in a year would be
=$2,573 + $602.25
= $3,175.25.