Please help me solve this with an clear explanation

Retirement Funding. Barry has just become eligible for his employer-sponsored retirement plan. Barry is 35 and plans to retire at 65. Barry calculates that he can contribute $3,900 per year to his plan. Barry's employer will match this amount. If Barry can earn a return of 12% on his investment, how much will he have at retirement? At retirement, the amount Barry will have is $ . (Round to the nearest dollar.)