When your father was born $51$ yeas ago, his grandparents deposited $275$ in an account for him. Today, that account is worth $15,000.$ What was the annual rate of return on this account? $8\mathrm{.}16$ percent, $7\mathrm{.}61$ percent, $8\mathrm{.}97$ percent, $6\mathrm{.}09$ percent, $7\mathrm{.}83$ percent