years ago at the annual family camping trip$,$ your Uncle Louis told you that he had $ $90,000$ in his bank account. Today $(18$ years later$)$ Uncle Louis tells you that the account has $ $359,641\mathrm{.}75.$ If Uncle Louis never added or withdrew funds from the account over the $18$ year$$ period, what was the bank$$ account's annual rate of$$ interest?

The annual rate of interest is closest$$ to: the answer is $8\%$ and i need the description thanks