You made an investment of $$14,500$ into an account that paid you an annual interest rate of $2\mathrm{.}6$ percent for the first $4$ years and $7$ percent for the next $8$ years. What was your annual rate of return over the entire $12$ years?You made an investment of $$14,500$ into an account that paid you an annual interest rate of $2\mathrm{.}6$ percent for the first $4$ years and $7$ percent for the next $8$ years. What was your annual rate of return over the entire $12$ years?