So the total amount before income taxes and FICA is 250$.
First, you find the amount after income tax which you can do by....
250$- 250$(5.65%)= 235.875= 235.87
or
250$(100%-5.65%)= 250$(94.35%)= 235.875=235.87$
Then apply the FICA
235.875$(100%-7.65%)= 217.83$
Net pay: 217.83$