You have an investment account that started with $$$$3,00015$ years ago and which now has grown to $$$$18,000.$

a$.$ What annual rate of return have you earned$($you have made no additional contributions to the$$ account$)?$

b$.$ If the investment account earns $14\%$ per year from now$$ on$,$ what will the$$ account's value be $15$ years from$$ now?