help!! and please explain the calculation detailed!! why $8000 and is it -8,000 (negative) or 8,000 (positive)?

thank you

George has been employed by SEC Corp. for the last 212 years. George participates in SEC's 401(k) plan. During his employment, George has contributed $5,000 to the 401(k) account. SEC has contributed $2,500 to George's 401(k) account (it matched 50 cents of every dollar contributed). George is considering quitting his job with SEC, calculate his vested benefit in the 401(k) account, assume the account balance is $8,000 ? a. SEC uses a three-year cliff vesting schedule. b. SEC uses a six-year graded vesting schedule