Ester Seals has just given an insurance company $41,625. In return, she will receive an annuity of $5,000 for 15 years.

Ester Seals has just given an insurance company $41,625. In return, she will receive an annuity of $5,000 for 15 years. At what rate of return must the insurance company invest this $41,625 to make the annual payments? Interpolate.