Yvette has a checking account with $17,371 and a savings account with $240,000. Her combined money in Apexon Bank is $257,371.
To know how much of Yvette's money is protected you must note that:
FDIC insures: checking, savings, money market deposits and certificates of deposit. FDIC protects against $250,000 combined.
Since Yvette has $257,371 the FDIC protects against $250,000 of that amount leaving $7,371 unprotected.